I believe they are still sitting on them at the moment...
But... the soon to be released Core 2 Duo has EMT64 extentions so you can run 64 bit software (a'la Vista).
Just finding out that information, supposedly the Core 2 Duo blows away everything at AMD at the moment, which kinda sucks.
Of course, if you run something like XP x64 then try to run 32 bit software, they supposedly run like crap because the OS is pretty much emulating for them. Or at least this is what I understand. I don't actually have a 64 bit processor or XP x64...
Guess the 64 bit version of Vista will fix that problem, though.