Leopard is out, and many users are excited add this feature rich upgrade to their Mac. Please, make sure you back your data BEFORE taking the plunge. There have been scattered reports of Leopard not installing correctly due to lack of space or incompatible software.

We reccommend users do an Archive and Install. A great write up on this topic can be found here:

http://www.macfixit.com/article.php?story=20071026082852658

Update: 10/27
Issues:
Mac the Ripper does not work.
FileMaker products do not work.
Instability problems with Adobe Creative Suite 3 (perhaps earlier versions of well)
Canon wide format printers.
Major apps that DO work:
Toast 8
MS Office 2004