Three things:


1. Community
2. Service oriented architecture
3. Wirelessness


It's as simple as that. For example:

Community - blogging, podcasting, vlogging, doing favors, revealing yourself to the world.

SOA - no more programs on your hard drive, just use them over the Internet. If they ever finish that 100 $ laptop project we'll see plenty of new users searching for these new services, 'cause there's no hard drive in those laptops and they're planning to distribute as many as 150 million of them.

Wirelessness - Wifi, Wimax, 3g... do I need to say more. No matter where you are, soon you'll always have access to Internet and imagine how easy it's going to be to share you're world with everyone when you can send text, photos, sound and video all no matter where you are.

This Web 2.0 is going to get HUGE this year and money will be made by those who are clever, fast and most of all, understand the fundamental logic of Web 2.0.