Very interesting. I figured it wouldn't be too hard to get that working. But as Ingo said we would still need to test a lot to make sure everything works properly. I think for R1 we can minimize the risk by limiting the GCC4 apps to only those that require it (like my WebKit port and associated browser.) The rest of the system can be GCC2. Things like deskbar addons would have to be compiled with GCC2 and we should probably put in checks when dynamically loading to make sure someone isn't trying to load a GCC4 addon in a GCC2 app. But this is definitely good news.
I'd like to post a news item unless someone has any objections. --Jon