Apart from the annoyance of not being able to enable Glass on my Acer C110 I am so far really pleased with what I have seen.
Flicks - these first appeared a while ago but acted in the same directions as dragging a document in Acrobat Reader (you had to flick down to scroll up and up to scroll down).
Well he good news is that MS have obviously been listening and you now flick in the direction you want to go so that flick down now actually scrolls down!
TIP autocomplete - autocomplete from the TIP is now implemented and rocks! When entering text via the TIP a small popup appears above the TIP with previous entries (will have to get a screenshot of this)
Start Menu - as you no doubt saw with the screenshots of the leaked TAP build, the Start Menu has been revamped in order to make it more streamlined. Some people moaned about the icons for items on teh right hand side being removed but a large icon pops up in place of the user picture when you mouse over items. Looks cool.
Improved Tablet Button support - Tablet hardware buttons now have extra options. As well as being able to assign actions to them normally you can now assign actions to the "Press and Hold" event for each button giving you greater flexibility with a slate or convertible in slate mode.
Touch training - as well as pen training on the Tablet you now also get "Touch Training" so that you can practice using Vista on Touchscreen devices.