Upgraded the blog to WordPress 2.1 last night and I have to say it went very smoothly with the easy to follow upgrade instuctions.
There are some nice new features such as Autosaving posts, a tabbed editor that can switch between WYSIWYG and code editing and full XML import and export.
I will run it here for a little while before updating some client blogs but so far it’s all gone off without a hitch.