i like most dubstep, some indie (
http://www.youtube.com/v/SJjQWejPiX4), some drum and base, house, some old school real hip/hop (
http://www.youtube.com/v/n7YYP85qhwM) & rap etc. Artists like chase & status, flamboyant bella, quit your dayjob, etc are alright too.
Used to work at a venue, so i've seen a lot of big names - ting tings, pendulum, cribs, hives, enemy, dissee rascal, prodigy, maroon 5, we are scientists, bloc party, joe lean, sum 41, kooks, etc -- most of them are shit though
Fun songs are also always good, like:
http://www.youtube.com/v/u6h8_b_N6Ig
http://www.youtube.com/v/w4A5ZnPPSUUetc