I grabbed Skyrim and The Witcher 2 at 50% and 60% off, respectively. Great deals and I doubt they will get any cheaper before the sale ends.
By the way, for anyone getting Witcher 2 in the Steam sale, you can then head over to GOG.com and enter the CD key to obtain a free copy downloadable from them as well. Reason being that the GOG version comes with a bucketload of extras, maps, soundtrack and such, plus you can plkay it offline with no Steam access. It's totally kosher to do this - they're the makers of the game and apparently like to reward buyers, no matter where they purchased it.
The same goes for Witcher #1 - they give a free offline-valid copy of that if you just enter your CD key, and it also comes with all the extras.