Okay, so I just found this site off a Kotaku link for a DD sale on Amazon (ArmA II: Arrowhead for $10 is pretty good!). Never heard of this site before, and it's labeled in Beta. It's basically a huge compile of all the Digital Download providers and the sales they are running, constantly updated. It includes some basic filtering categories (by shop, latest, most popular, etc), and it also allows you to search for a specific title. Then it shows you all the shops the title is sold at (or should, I searched for New Vegas and it only showed Steam though I'm fairly certain it's also up on D2D), as well as the prices (including sale). So if I wanted to get, say, Torchlight, I see that it's 4.95 on D2D and the next cheapest is 9.98 on Gamersgate (http://www.deals4downloads.com/games/detail/nl/torchlight-pc)

It's been keeping up with the Steam/Impulse Christmas sales very well it looks like, so it looks to be a good resource when shopping around

And no, I'm in no way affiliated with the site, just figured I'd share for the rest of the people who love sales