As in url’s… OK so I am a geek!
http://linkedin.com
http://pbwiki.com for organizing with others…
http://twitter.com for informal chats
http://skype.com for free international chats via the internet
http://zoomerang.com for online questionnaire generation
http://eventbrite.com for event hosting and behind the scenes planning
I think I could go on forever with the list but I’ll stop there. The simple answer is if you are looking for a tool online then shout because I’ve probably come across something and if not then I’d be interested in hearing about where the need for the tool comes from.