They appear to be changing the task bar for the sake having something new in your face. Now it conveys less information just so that it can look like the similarly dubious OS X dock.
You can change the taskbar buttons to how they "normally" look if you like. But I like it with the smaller buttons and the previews it gives you.
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I think its nicer than Vista and seems a lot fast.
Here are some screenshots if anyone is interested.
The background is on a slide show and you can set it to change from every 5 seconds to a day. I think its a neat touch.
Desktop
MSN Preview - does this with most minimised stuff, like Firefox / IE. If you have multiple tabs you can see them in the little preview box aswell
Folder preview
Personilse menu
Control Panel
More control panel options
Well so far ive installed, Skype, AVG, SB S&D,FF, Thunderbird, MSN, Winamp, Steam, CS:S, ATI Vista 32bit drivers all with no problems at all.
I really like this, its smoother than Vista, easier to use, some really nice features which I think are great.
So far I love it.