Twiddla: Free Interactive Space

http://www.twiddla.com/Home.aspx

Mark up websites, graphics, and photos, or start brainstorming on a blank canvas. Browse the web with your friends or make that conference call more productive than ever. No plug-ins, downloads, or firewall voodoo - it's all here, ready to go when you are. Browser-agnostic, user-friendly.

Don't like to sign up for stuff? No worries! You don't need an account to use Twiddla - and neither does anybody else. The people you invite to meetings will never see so much as a login screen.