Cellphones added another item to the list of what we can’t leave the house without. In fact, we’re as dependent on our cellphones these days as we are our wallets and our house and car keys.

The dependency on our mobile devices -- which has extended into mobile multimedia technologies with Internet access, datebooks, phonebook and even Microsoft Word -- is just the normal progression of technology. After all, your mobile device is always on, and it’s always with you. So why not use it for other technologies?

When I attended the Dow Jones Mobile Technology Summit in New York last week, there were three major buckets that the companies wanting to revolutionize your mobile device fell into: mobile content, location-based services and enterprise mobility.

Today, we’re going touch briefly on these new Web 2.0 technologies, and how you can profit from them.

Mobile content

Mobile content is best described as content that is viewed or used on mobile devices, like music, video, ringtones and graphics. By perusing this content and making choices online, you can easily download them to your device.

The new trend is for made-for-mobile content, like short clips of video that can be viewed on a smaller screen and in shorter time spans. More than half of the world’s population owns a mobile phone subscription, and more multimedia devices are expected to be sold in 2008 than television sets and basic cellphones -- combined!

Many telecom companies provide their own content for users to download. But the major consensus by industry outsiders at the Mobile Technology Summit was that telecoms should focus on what they do best: infrastructure and service, not videos and photos.

Private companies that presented at the conference included Frengo, a service that allows you to gossip and send information back and forth in a community and read the latest “buzz” on your cellphone; uPlayMe, a video sharing site for use on your cellphone; and Mobicious, a directory for the best mobile content.

A good, cheap and public company I found that looks like a winner in the mobile-content industry is m-Wise Inc. (MWIS:Nasdaq). It makes, markets and supports interactive messaging platforms for mobile applications. It allows companies to provide mobile content to users. MWIS is a penny stock right now, valued at 11 cents per share. But it hit 33 cents per share in January, when it expanded into Europe. MWIS just partnered with ad-funded entertainment company InnerActive Smart Media, and its recent earnings report showed that income increased by 26% quarter over quarter.

If you’re looking for a cheap but emerging market leader in mobile content, this is a winner.

Location-based services

Until recently, location-based services have been known to consumers as global positioning, thus the popularity in GPS units to get us from here to there.

Location-based services uses the location of the user and the mobile device to broadcast location-specific ads or coupons, or even information about real estate or places to eat.

I found myself completely awed by some of the private LBS companies that presented at the forum. For one, there was Socialight, a site consisting of a watered-down blog on top of a map. Essentially, you can find yourself anywhere in New York City and read notes on where to find your favorite beer within five blocks, or the cheapest nightclub to go to. And you can also post short notes to other peers about places you go.

Another start-up was RoboCal, which builds voice recognition and GPS software on top of existing programs. Essentially, you use your voice on your cellphone to tap into your appointment book, find out where you need to be in the next half-hour, and the best way to get there according to where you’re currently standing.

And while that’s all fun and games, GPS is still a large portion of industry.

A good play on LBS these days is Trimble Navigation Limited (TRMB:Nasdaq). It’s currently on a dip near $30 per share but hit as high as $43 per share this year. It provides advanced positioning solutions to commercial users, some in the mobile industry. It holds over 700 patents on its technology and increases productivity in multiple industries by connecting contractors and other workers to jobs close to their current position in the field. TRMB is working on expanding its mobile applications for GPS and LBS services, placing it at a great spot for continued profitability in 2008 and beyond.

Enterpise mobility

Which brings us to enterprise mobility. In essence, this is mobile technology and wireless information technology solutions for larger companies and enterprises. It covers not only mobile devices, but syncing them up to laptops, PCs and phone systems and correlating voice and data services.

Global Bay Mobile Technologies currently has the best plan in this arena. It does the dirty work for companies, providing them mobile applications to automate and digitize their current manual business operations. In 60 to 90 days, Global Bay can deliver a custom platform to companies, turning reams of paperwork into easy-to-follow consistent systems on mobile devices. For example, a plumbing company sends an employee out to a call. Once the work is done, the plumber takes his PDA, fills out the important information on an automated touch-screen form and sends it in to the company’s main center of business. All work is done the same way, and all data goes the same place, decreasing mistakes and increasing efficiency.

Global Bay was actually very honest about its success: It plans to be an acquisition target, most likely for its biggest partner, International Business Machines (IBM:NYSE).

In January, Symbol Technologies (under the symbol SBL), a leader in enterprise mobility was gobbled up by Motorola Inc. (MOT:NYSE), showcasing how important this trend of streamlining business operations remains.

Aruba Networks (ARUN:Nasdaq) is a great play on this mobile wireless trend. The stock is undervalued at $14 per share and looks to have hit bottom recently, indicating and upcoming price pop. ARUN is a leader in secure mobility solutions for companies and enterprises. It helps to integrate personal solutions with work solutions, allowing users to have one handheld device for work or play, on which they receive their voicemail, e-mail and other messages on secure wireless networks.

The drive to make business more efficient through technology solutions continues to be a hot subject. In fact, this month’s newest Diligent Investor issue focuses on data management and data integration, and happens to showcase a company that is a prime target for acquisition by IBM, just like Global Bay.

I urge you to get on top of this opportunity to make 189% on the hottest acquisition in enterprise software today.