Vista Versions Finally Finalized
It looks like Microsoft has made up its collective mind about the editions of Vista that will be offered, and as expected, there'll be no more Tablet PC or Media Center Edition. The six core versions include: Starter Edition, Enterprise Edition, Home Basic, Home Premium, Business and Ultimate. There will also be two "N" versions (Home Basic N and Business N) that are customized to comply with the European Union's orders not to include Windows Media Player with the operating system. You can read more about it here:
About half way down the page.