I didn't see much of the Yeah Yeah Yeah's performance at V Fest (had to run and get a good spot for the Wu) but I liked what I saw. I can take or leave the music, but the group is fun to watch and Karen O is usually good for one or two awesome photos per set. Here's mine.

Other V Fest photo sets:
Interpol
Wu Tang Clan

[MP3] Yeah Yeah Yeahs | Maps (Peel Session)
[MP3] Yeah Yeah Yeahs | Gold Lion (Nick Zinner Mix)