If you haven't gotten the chance to try Beta 2 of Windows Vista but still want to know what the deal is, there's a good first-impressions write up
of it available. Including a gallery of screenshots from Beta 2 (though they are markedly the same as the first beta) as well as outlining some points of change, it's worth a read if you're a bit timid about placing it onto a production machine just yet. The task manager changes are noticeable, though the article doesn't go at all into application compatibility. Aesthetically it's not something to complain about, of course. If you don't currently have access to it, you can still get in line for TechNet to download it later
when it becomes more publically available.