Sept 24 2007
I wanted to follow-up to a previous Tip from Feb 25 'So You Think You Are Ready for Vista?' of this year regarding the software compatibility problems with Microsoft's Vista.  Here are the updates since that time:

iTunes:
iTunes is now Compatible with Vista.  You can download the latest version 7.4.2 at: http://www.apple.com/itunes/download/

Palm:
Palm Desktop software and HotSync is compatible with Vista with a few limitations.  You can download the Vista compatible version at: http://www.palm.com/us/support/downloads/.  Download the Palm Desktop and HotSync after selecting your Phone model and Carrier.

QuickBooks:
QuickBooks 2008 compatible with Vista
QuickBooks 2007 compatible with Vista
QuickBooks 2006 NOT compatible with Vista
Here's the compatibility chart of supported QuickBooks versions from Intuit.

ACT!:
ACT 2008 compatible with Vista
ACT 2007 limited compatiblility with Vista after download and installation of the Windows Vista HotFix
ACT 2006 NOT compatible with Vista
ACT Premium for Real Estate NOT compatible with Vista
Here's the compatibility chart including links for addtional support and download information from Sage Software.

If you are still considering Vista, be sure that ALL YOUR PROGRAMS will run on Vista especially your PRINTERS, SCANNERS, CAMERAS, and anything else you plug into your computer.