Windows Vista is very impressive but it also has some serious problems that Microsoft needs to address prior to release. How serious are the problems, read the whole thing and decide for yourself:

- The bad news is that most motherboards stop at 4 gigabytes and each process can only use up to 2 gigabytes of memory (3 with tweaking) unless they use AWE (Address Windowing Extensions) which is not something most developers want to get into.  So why should you care? Because Windows Vista uses a lot more memory than previous versions of Windows right now. 720 Megabytes are used on a fresh boot (on my test box) vs. around 250 Megabytes on Windows XP. And that's before third parties get their hands on it and put on their stuff. To be fair, I could probably get this down to 500 megabytes with some power user trimming (just as power users can get XP down to under 100 megabytes). But you're talking about a lot of memory. For most people, tossing on 8 gigabytes of memory onto their machine isn't an option. Going to 64-bit is the next step but that may prove harder than most people think because many applications require 64-bit specific versions.