I blogged last year about JotSpot’s wiki product (acquired by Google). Another tool in the similar area is Vyew, a web conferencing solution (mentioned by Lars Plougmann). I like the idea of being able to share documents, spreadsheets, PowerPoints, etc online with mark-up, whiteboarding, and text-chat all enabled via a standard browser. And best of all, it’s currently free! I’m hoping to try it out later this week.