Well, I find the windows grab feature sometimes annoying when moving stuff around my screen. I do have rather a lot of screen real estate so I dont need to compare docs or maximise windows. Drivers are still a bit glitchy and have removed ccc 9.8 and back on 9.7 but that's not Windows fault, I guess. Love the new task bar and best thing of all is the background fade. I have over three hundred hi res backgrounds in a folders and they look great fading in and out every five mins.
Not quite as stable as Vista yet but is damn close. Virutal PC is a breeze although I still use VMware as it is much better and supports more OS. Homegroup is nice and easy to share media and streaming my AVi's to my laptop is great. The only thing missing from media centre is the ability to make it an extender like an Xbox and be able to control the DTV tuner in my main rig from my other machines. Love the new media centre, great from recording TV as you can easiy skip adverts because you get a little preview of where you are in the recording when dragging the progress bar. It also supports my rubbish Bluetooth dongle without extra software or have to pay to use more than 5mb of data!