Immunity has a few things that are freely available and are of interest:

Regarding papers, Exploit Dev with ImmDBG, Intelligent DBG, Understanding and Bypassing Heap Protection, Exploiting the PHP_Limit bug, Linux Heap Overflows, and MS Heap Overflows I & II are all pretty good and technically oriented. They don’t speak to any specific certification though.

Papers etc: http://www.immunityinc.com/resources-papers.shtml

Immunity Debugger is free and more polished than OllyDBG (In my opinion anyway), SPIKE and SPIKEProxy are great but have a bit of a learning curve to them.

Software: http://www.immunityinc.com/resources-freesoftware.shtml

Forum: http://forum.immunityinc.com is great for folks who use the
Immunity Debugger.