We've just upgraded one of our apps at work to use a component driven MVC architecture and one of the first things that happened was the old java out of memory error. I found a good post of sarges blog that shed some light on the situation.

http://www.sargeway.com/blog/index.cfm?mode=entry&entry=27 

I've made some adjustments and we'll see how it goes. If anyone know's any other good articles on this topic I be glad to have them for future reference.