CheapShark

[Ashenfield]

http://ww1.cheapshark.com/browse.php

Interesting site. Tries to keep a running database of game prices from a number of digital distributors so you can get the best price.

[Dizzarian]

Nice, I had been using http://www.steamgamesales.com/ but it's rather incomplete and things fall off of it if it's not on sale so this is much better as it has a lot more sources

[Spidubic]

Very handy. Almost too handy............Must resist......deals......