Until yesterday, I was running WordPress 2.2.x as the site engine. I was thinking of upgrading to WordPress 2.3 or named Dexter, but I too much work to do and i didn’t have any spare time. Therefore, do this yesterday since i have too much time for my self and my blog.
I didn’t have any problems and upgrading was really easy, i have some problems with some plugins ( but i eliminate that ) also my theme is 2.3 ready so i didn’t have any problem with that too . Even my admin plugins works ( it’s loads my dashboard much faster ).