I've picked up:
Mutants & Masterminds
Freedom City
Crooks
Time of Crisis
MnM GM Screen
True20
Freeport: City of Adventure
Death in Freeport
Terror in Freeport
Madness in Freeport
Denizens of Freeport
Tales of Freeport
Eternal Rome
The Black Company Campaign Setting
The Trojan War
Testament: Roleplaying in the Biblical Era
Green Ronin puts out great material. I'm especially fond of the Mythic Vista books I bought (Eternal Rome, Black Company, Trojan War, and Testament), but I also had a great time with Freeport. MnM and True20 are both fun, too. I used True20 for an "ancient Greece" mini-campaign and it worked great.