Consumer level support for Hyper-V technology - but it will be in there most likely. The 2008 core work has been a fantastic advancement. - Soulhuntre from twhirl

Time Machine, Spotlight, XCode and QuickSilver. Oh, and more cowbell. - Gerald Buckley

Support for common hardwares, less or no BSOD, less memory usage... - AJ Batac

A system that works and is secure. Something that doesn't require trickery through clever advertising to generate buzz about the product. Something that actually delivers on the promises that Microsoft never seem to deliver on. Regardless, I am already a Mac convert, so it needs be something that can make me a true believer before I even consider it. - James Mowery from twhirl

MinWin. - Akiva Moskovitz

Oh yeah, and a product that doesn't have 6 different options (or however many it is). Give us something for server usage, business usage, and home usage. Microsoft doesn't need to confuse the hell out of their users to sell an operating system. - James Mowery from twhirl

Fan Control and Exposé - Johnny Worthington

Mac OSX Leopard, to satisfy the fanbois - Jon Limjap from twhirl

i would like to see it forgotten. :P - imabonehead

The service packs included - Charlie Anzman

The source code. - Jack (a.k.a. Jeber)

it should suck 'less' - Saad Kamal

a new file system...finally. - Carlos Ayala

A new file system would be nice, but it isn't like NTFS isn't very solid. I woudl also liek to see the SKU's drop in quantity - again, the Server 2008 work is a real boon there - the fully modular install from command line only all the way to full blown UI with bells and whistles. No need for separate SKU's to tune for a use case any more. - Soulhuntre

A working and non sluggish OS and no IE - Outsanity & Kate + Hate

The ability to punch smug OS elitists in the gonads from anywhere in the world. - Akiva Moskovitz

Better integration with webcams which are now included in most notebooks. If I buy a notebook with a webcam, Windows ought to be able to do something interesting with it right away. Along these lines I'd also like to see a virtual camera model that facilitates switching between cameras, screencasts, and the like. This is too low of a level of behavior for 3rd parties to do. And of course there ought to be an API in the .NET Framework that makes using the video stream(s) easy. - Loren Heiny

dual-boot OSX & Final Cut - Richard ¿digame? Walker from twhirl

Vista with an emphasis on performance. WinFS. A security model that doesn't piss me off. Unlock theme support so people can customize without having to "hack" their system or download/purchase software to do it for them. Take a note from OS X on usability. Give Explorer a redesign inline with Finder, or even better Gnome's Nautilus. - Evan Sims

Open source but the relied upon build still coming from Microsoft. That's not going to happen. So how about making it a lean OS maybe putting some of the code in the BIOS. So then UMPC's and MID's can have some direction. - Rodfather