> And the reason for wanting a i386 userspace is ... ?
I like it because it keeps evolution, firefox and chrome all limited to 3Gigs of RAM. I have two boxes I use (one is very work specific, the other is personal, although I use it for most my upstream work as well). My work box is a true x86_64 install base. My personal box is i386 userspace running a x86_64 kernel. Both have 8Gigs of RAM.
My i386 box never has issues with fire-fox, chrome or evolution taking up all my memory. When they get too big, the worse that happens is that they crash and I just restart them.
On my x86_64 box, these apps take over all RAM and it's not till I notice the slow down before I restart them.
Both these boxes run 24/7 so a daily shutdown is not there to clean things up.