I'm a big fan of electronic music and used to DJ, so all kinds of electronica, dubstep, garage/2-step, a bit of house/electro/tech house, drum & bass, and recently a lot of techno. Pretty much anything fast with a steady beat.

I find techno to be good music for coding to because it is very subtle and has long build ups whilst maintaining a decent pace. I'm still new to techno but I'd recommend both the CLR.net and Drumcode.se podcasts, but get yourself a decent pair of headphones :)

Dubstep can be fantastic for coding but I prefer the darker more underground tunes as opposed to Skrillex and the poppy sound which gets played a lot recently. Keep an eye out for tunes by Mala, Kode9, SP:MC, Distance, Lynx, Skream, Loefah. I listen to Youngsta's shows on Rinse.FM which you can download from their site on Tuesday mornings GMT.

Also some downtempo/chilled stuff is good for more relaxed coding. I've enjoyed Emancipator's albums over the last couple of months and would recommend them to pretty much anyone.