I’ve seen Jill Bolte Taylor’s talk and Sir Ken Robinson’s talk and they are both great. The other eight are likely to be as good. So go see, Top 10 TED Talks courtesy of Boing Boing
P.S. I like watching my on the subway using my Apple Touch. If you are going to load alot of these videos up, though, you will want a bigger one than mine (the low end 8 GB).