As with all upgrades, remember your experiences in making any decision. All of the Windows upgrades eventually needed upgrade or Service packs to fix something that was missing or outdated. Windows XP is no exception, we have had SP1 and now SP2 and continuous updates. I doubt very much that Vista would be different. So, my advise is wait a year and see what bugs come up before buying or upgrading. Otherwise we will all be learning from your experiences with Vista first hand. Here is the link to the Vista website;
http://windowshelp.microsoft.com/Win...S/default.mspx
Here is the link for the Upgrade Advisor, remember it is just an advisor, nothing is etched in stone;
http://www.microsoft.com/windowsvist...r/default.mspx
There are many factors that will affect your upgrade, make sure you read carefully what is required, always go for the Recommended, not the Minimum Requirement to fully take advantage of the features. And make sure that all devices like Printers, Mouse, Wireless adaptor and software are compatible with Vista which means you will have to do your homework with each individual manufacturer. Best of luck to all of us during this transition. John