The next version of Windows is Windows 7 and is built on Vista SP 1
The Milestone of Windows 7 requires Vista Sp1 installed
No matter what happens in the future, it will be Vista based.
For those of you who are considering Vista or newer OS systems, Just remember you can Dual Boot your system into XP. Also Vista gives you the right to Downgrade in the EULA thus giving you a XP key directly from Microsoft.
Finally I put a guide, stickied to the top of the forum on how to dual boot, which will allow you to put XP on newer systems, for older software compatibility, plus run the latest OS for newer software that XP can't support.
I'm Dual booting my system, however I only need XP currently for Visual C++, and 3D Studio and to play SFC OP online , and to run Dominion Wars
All my other software works better in Vista.
Once you have your software installed in Vista and you don't like giving permission to run each program, go into control panel to User Accounts and disable UAC, restart system.. now the security shell on your system's kernel will be gone and you don't have to give permission.
Just that simple.. People make things harder than what they really are.. Vista comes with full security enabled.. like 3 Firewalls, Windows Defender, UAC, the only thing not enabled is Internet Protection, but there are 5 levels of that if you want to enable it.. Plus you have your AV software, Spybot S&D, Ad-Aware 2K8 (Beta currently but works great), and many other programs that help protect your system, and routers to be your first line of defense as a hardware firewall.
It is not hard to get your system to Dual boot.. it took me all of 3 hours after partitioning my drive to get XP to dual boot, and most of that was waiting for XP to install from the CD..
Vista blows XP away in gaming with DirectX 10, hands down. Games that will work on Vista play better.. However there are some programs that are incompatible because of the way they are programmed or the software that was used to build the program was out of date at the time the program was released, and since Vista demands better programming standards, those programs, though they worked on XP, are now defunct in Vista.
My recommendation is that if you have older software, but want to keep up with your system and hardware, then Dual Boot your system..
Anyhow, just my 2 cents.