Ishkur's Guide to Electronic Music has been remade. It is a great sampler of all the many, many genres of electronic music that are out there. You'll like some, hate others, and laugh at the rest.
The new update now includes several clips of each type of music (instead of just one clip like previous versions had). It should give you a decent taste of each of the types of electronica out there.

Tommy, you mean its not all called "techno"??? *gasp* No, although most people call it "techno", Techno is but just one class of electronic music. So check out what all is out there.

By the way, props to Ishkur for adding the seperate Downtempo section - I'm ALL about that stuff. And the time-maps, lets you know when things came out and what/when they evolved from.