Ok, I was a little skeptical on this one before hearing/seeing much about it, but now that E3's come and gone, I'm much more impressed with what was on demo.
For those who don't know, Activision is releasing DJ Hero in the fall, complete with turntable peripheral and 80+ versus tracks of popular songs remixed by well known DJs (Z-Trip, DJ Shadow, etc...). I didn't think it would be that good considering the pedigree for this type of game, but after seeing it in action and seeing how the turntable works, I'm thoroughly impressed.
Here's some of the gameplay that was shown at E3:
Most of these videos are on expert mode, but there are 5 different difficulty levels, so there are easier tracks than these. This is to give an idea of how it plays...
Benny Benassi "Satisfaction" vs. Black Eyed Peas "Boom Boom Pow":Gwen Stefani "Hollerback Girl" vs. Rick James "Give It To Me Baby"
Beastie Boys "Sabotage" (on decks) vs Foo Fighters "Monkey Wrench" (on guitar):