Just seen that the sale is on, and i've only grabbed terrarria (£1.49 is cheap as dirt) so far, but i'll likely end up spending a hundred quid or so. Waiting for stuff like Saint's Row 3 and Skyrim to go on daily deal offers before I spend on them, but it's safe to say i'll be watching the store very closely throughout the whole sale period!
Also I think (please correct me if i'm wrong) Shogun 2 on Amazon can be activated through steam, and that's been at £7 and dropping for a while now, so if it's worth it to you it might be cheaper there sooner than later.