Google has lots of very good programs - the search engine ofcourse, but also Gmail, Google Maps, Google Earth, Google Desktop etc.
Ofcourse Wikipedia is also great.
I tried Second Life for a while, and the idea is interesting, but after a while I got bored with it. It's a lot of hype and there are a lot of companies that think they are missing something when they're not in Second Life, but I think that for now it's just a lot of hype and not the revolution that some people think it is. [ August 30, 2007: Message edited by: Jesper Young ]