WordPress 2.7 design

Hello all,
Well, I like the new version of wordpress – 2.7. However, I am finding it a little confusing, just because it is new. I’ve done some searching but there doesn’t seem to be a set of documentation that will give a clear or easy to follow (at least to me) set of instructions for those who have used wordpress 2.6.x and are now upgrading to 2.7. Sure there is the new features list but it isn’t completely clear to me because some of the features/options are somewhat unfamiliar to me.
I found the great tools – Simple Tags, and All-in-One SEO pack – and they don’t seem to work the same way. Also, is there any reason to think that plugins that worked fine in 2.6.x will not work in 2.7?
I had a book that I bought to get to speed in WP and have been using v 2.6, so I don’t need to start from scratch with a full text on WP that is updated for 2.7, or do I?
Can anyone recommend some good ways to get a good handle on things? Maybe I need to learn more about some of the jargon, technologies and such, so that when I see what was updated, I can say, “oh, I know what that means… that’s a good new feature.”
Any tips? Anyone?
Thanks,
Bruce