As I mentioned in a previous series of posts, we recently had all the major OEMs on campus to discuss SDL and how we can work together. My big ask of the OEMs (actually, I grovelled, it was pathetic) was to enable DEP/NX in the BIOS by default on all their shipping PCs in time for Windows Vista.
The reason for this ask is pretty simple, for ASLR to be effective, DEP/NX must be enabled by default too.
Here's the good news, I found out yesterday that all the major OEMs (you know who they are!) have agreed to not disable DEP/NX in their BIOSs by default .