Yeah the local currencies hardly ever make any sense. Anyway, if you people have twitter and prefer checking that rather than the real site, you can follow @topsteamdeals. https://twitter.com/#!/TopSteamDeals Every day all 12 daily deals get posted with their discounts, and prices in € $ and £.
Okay so I was waiting for someone else to resurrect this thread again. They're having an insane two week long holiday sale with flash sales every 12 hours. (Dec 19th - Jan 3rd) It's definitely worth keeping an eye on. There are a lot of "Game of the Year" or "Deluxe" editions up there every day. Most games are 75-80% off.