Oops, out of date! Party Zone (North Europe), Chill Out Zone (North Europe), and AMP (USA) are the main electronica shows on MTV at the moment. Party Zone is usually on from 11 pm - 1 am on Friday nights, and the Chill Out Zone airs on Saturday night / Sunday morning from 3 - 5 am Irish / UK time. MTV Europe doesn't seem to have much of a web page as of yet, but you can e-mail the shows at mtvpartyzone.dance@mtvne.com and chilloutzone@mtvne.com.
Web
Here are some to the best electronica web sites I've found.
Oops, out of date! This iMusic site features a whole lot of sound, including two superb quality concerts in RealAudio format, Orbital (recommended) and Prodigy live in Seattle. ClubiMusic Radio has the latest electronica tracks, and the ClubiMusic Showcase features a listing of artists with short biographies.
If you're interested in virtual deejaying on your PC, you should start off at the VDJ site where you can read information on the various MP3 mixing packages that are available online, including MP-3000F (my current favourite) and the older Virtual Turntables which can make use of DSP plugins.