Important Check Before Upgrading Your OS
As a rule of thumb, anytime you are upgrading or moving operating systems, it is important to make sure your essential hardware and software are supported on the new OS. Be it Windows XP to Vista, SUSE to Ubuntu, or OSX to Tiger (you get the idea), do your homework to make sure your stuff is supported.
In a perfect world, vendors would be on the same page as the developers, however this is not always the case. If your hardware or software is not supported on the platform you are moving to, be sure to contact the appropriate vendor and find out when support will be available.