Web 2.0 resources I have started using

Pageflakes - is a homepage creation tool, which allows you to add RSS Feeds and "flakes" from other sources.

Meetwithapproval - is a tool that allows you to create a meeting online invite everyone to it and then confirm the date. The tool lets you view unavailable dates so that you don't need to keep emailing everyone! This could save me a lot of time!

Grou.ps - is a site that lets you create a group (for friends, colleagues etc) and then aggregate sources from multiples sites e.g. blogs, flickr, myspace pages etc.

Collarity and Aftervote are relevance "rated" search engines and are definitely worth looking at.