1) Dark Ages: Fae by White Wolf
Jeepers! What a nifty game. It is what Changeling should have been. Basically, it gives you rules for playing fae creatures in the Dark Ages setting. Very nifty and, at times, very dark (a plus in my book). Art is solid, and the rules are absolutely great. I am thinking about doing a fae/demon civil war set in the Dark Ages if I ever get to run a game here in Bangladesh.
2) Mastermind by Alderac
A worthy successor of the Agency book. This is a toolkit in the purest sense of the word. Lots and lots of rules for Spycraft... from new bad guy PrCs, new henchman options, advice, and (glory of glories) an absolutely gorgeous random mission generator for Spycraft that is tailored to the general levels of the PCs. The silver line of Spycraft books has universally been some of the best implementation of D20 rules- and Mastermind easily fits with my favorite books in the line.
The rest of my buys were less exciting. Still good, but I like to keep these threads focused on rpgs that I think would be worth including in any collection.