Well, finally we are starting to see 64 bit apps from Autodesk hit the ground running. Currently Max 9 and Maya 8 are shipping with both 32 and 64 bit versions on the same disk for installation. There has been a ton of independant sites doing write ups on these apps and how they will be working towards the future of 3D graphics workflow. Normally most people wait for a little while prior to installing a new version of software. Don't wait this time for Max and Maya. I myself have been rather excited about the new features and the stability of them delivered on a release that was not done at it's usual time. Here's some links I recommend checking out if you are at all into the world of 3D.
Shaan Hurleys blog has already rolled a number of links together which point to some great articles.
If you are going to read any of the links on Shaan's page, read this one as I found it to be the most informative. You can always check out product reviews, but this goes into great detail about the 64 bit uprising.
Please keep in mind that 3D MAX 9 is only listed as being compatible with Windows XP 64 bit OS - NOT Vista.