I second this. di.fm is playing for about half my work day, and often when I'm at home too. I love the Trance and Vocal Trance channels, with forays into EuroClub, DubStep and Chillout Dreams.
di.fm has a lot of really good content. Highly recommend any trance channel (I like the classic vocal best) and their Chiptune channel.
For easily downloadable podcasts, Sander van Doorn's Identity (although he's leaning more electro these days), The Gareth Emery Podcast, and Global Trance Grooves are good ones.