I've spent a large chunk of time rewriting the memory system for Mortal Kombat. It was a huge and ambitious endeavor using a lot of new techniques that are not really used in other systems. Development on it was expensive but justifiable because we plan on reaping benefits from the system and eventually sharing it with other studios under the WB Games umbrella.
So my "Director of Engineering" told me today that Rock Steady Studios (the developers of Batman: Arkham Asylum) have integrated the Memory Manager I developed for Mortal Kombat into their latest game under development. It only took them 2 days without any help and was a very smooth integration. Right off the bat it saved them 4.5MB on PS3 which is an enormous amount to get back just from a memory manager and also it resulted in a large increase in stability for that platform.
Woo hoo! I feel pretty good about that.