securing heterogeneous networks

Okay, I have an abstract due tomorrow on Heterogeneous Networks. The actual focus on the paper is up to me so I decided to do security in a mixed enviroment. I have a book that is like 6 years old but need current references. Anyone know of a good site(s) that I could get some info from? Thanks in advance ppl.



hjack

hjack, the only help I could give you would be straight from google, and I'm sure you have already researched those. Are you more interested in an operating system mixed environment, or versions of the same operating system?