Google gravity isn't exactly what you would call "useful", but I could imagine using this to wake up an audience in the middle of a presentation. A nice conversation starter perhaps.
I've also been researching alternative and progressive assessment methods and enjoyed the Edutopia article shared by @valerieturpin.
I'm super excited to be heading to ISTE2010 at the end of June. If you are going, check out the tweet-up link below.
Finally, I'm always interested in the abundance of free learning resources offered by University's and individuals. Check out the open courseware links for Yale and UC Berkeley.
