Concrete Countertop HowTos

Here is a nice howto on making your own concrete countertop from the diynetwork that covers template construction, mold making, pouring, and finishing up.

Here's another very detailed tutorial from NaturalHandyman.com. Both are good, but the diynetwork breaks down the materials needed in a nicer format.

For some inspiration, take a look at Cheng Design to see some amazing examples of what's possible to accomplish with concrete.