Three sites worth your time

The lo-fi librarian does a periodical listing of "this week's useful tools," and a recent post listed several things that I think have real potential for library use.  Let me know if you're using any of these, especially in/for your library.

• Cluztr: This is a tool that lets you share your favorite websites with others, and get recommendations from friends.  It like del.icio.us, but (imho) with a slightly more friendly interface.
• Yugma: Free web conferencing tool.  There are premium subscriptions available, but this puppy allows you to share your screen, audio conference, include a whiteboard, have chat, and all without ads.  It also lets you create a widget that you can add to a website to let users web conference with you in one-click.  Wow!  Can we say "another virtual reference competitor" y'all?
• Blackle: *drumroll please*  This is my absolute favorite.  It's a Google Custom Search that is basically Google's basic search, but done in all black to save energy.  You get the same results as you do in Google, except without the "sub" results, the "page within a page" results, which is fine by me.  The homepage notes how many watt hours users have saved by using it.  It's my new home page.  It's black--what did you expect? ;)