The iPhone 5 launch on Wednesday, Sept. 12, is sure to be the most important event for tech investors this year. The Motley Fool will be hosting a live chat where our top tech analysts will answer your questions and break down what the announcement means for Apple and tech investors everywhere. Be sure to swing by Fool.com at 12:45 p.m. ET next Wednesday for all your coverage of Apple's next big announcement.

The following video is part of our “Motley Fool Conversations” series, in which analyst John Reeves and advisor David Meier discuss topics around the investing world.

It's clear that the world is going mobile. Over time, advertising dollars will follow, and John and David take a look at some companies that should benefit from this powerful trend. Internet-radio leader Pandora, for one, reported some encouraging numbers recently. More people are using its mobile app, and ad dollars are starting to follow. TripAdvisor is seeing more and more mobile usage, too. So it's clear that the trend is starting to build. Two companies that John and David are researching are Velti and Millenial Media. Velti provides technology and services to help deliver mobile advertising and marketing. Millenial Media operates a mobile technology platform for developers and advertisers. Both companies are promising ways to play the mobile advertising trend.

The mobile revolution is still in its infancy, but with so many different companies out there, it can be daunting to know how to profit in the space. Fortunately, The Motley Fool has just released a free report on mobile named "The Next Trillion-Dollar Revolution." Inside the report, we not only describe why this seismic shift will dwarf any other technology revolution seen before it, but we also name a company at the forefront of the trend. Hundreds of thousands have requested access to previous reports, and you can access this new report today by clicking here -- it's free.