If you didn't manage to download the whooping 3.5 GB setup for Windows Vista Beta 2, you can view some screencasts recorded on a Toshiba Portege M400 Tablet PC (you need QuickTime, if you don't have it I recommend QuickTime Alternative).
You can view the Aero interface, the new Media Player, Windows Sidebar, the search features integrated in Vista and how to improve handwriting recognition on a Tablet PC.
If you want to download Vista, Microsoft's site is not very helpful. Because of a big demand, most people who try to download Vista are unable to access the download site. In case you're feeling lucky, here are the direct links for the 32-bit and 64-bit editions. You can also try an unofficial BitTorrent.
Vista Beta 2 can be used until next year in June and you won't be able to upgrade it to the final release. So if you have an unused computer that meets Vista specs, give it a try.