Tried the new WordPress 2.1, "Ella" as a local install yesterday. Some of the added features, such as importing from WordPress, more options with links and categories, revamped editor that allows you to switch between visual and code mode through tabs, etc. are pretty cool. And these added features meant, I couldn't wait any longer to upgrade my live WP install.
Fortunately most of the plugins that I have installed are still working and the theme that I have modified has been working without any problem as well...so all in all, I'm pretty happy about the upgrade.
I am currently creating a new visual layout for the K2 theme on my local install WP and when thats done, I'll probably change my theme to K2...for now the old face of random jottings... stays!