MindMeister is a Mind Mapping tool that makes creating a Mind Map easy. It has a smooth drag and drop interface, auto-save, and real time collaboration. You can add your Skype ID and start conference calls while editing a map and include twitter notifications when changes have been made by another us...

Spock is a people search engine with a ton of cool features. The search results are more like mini profiles of people who match your search term. Each person has tags associated with them which are used to make finding them easier. The tags have a drop down menu where you can vote on whether or not y...

Furl doesn't use 'tags' but rather 'topics' - also in Furl I can't see as easily how many other people have bookmarked the links that I have, however Furl shows me how many others have 'viewed' my links on my front page (I have to click on my link to see who else has "furled" or bookmarked my link)

You will learn a bit about how to set up and use del.icio.us, a social bookmarking tool. It's rushed at the beginning, but it gets a bit better.