This site is now running Apache Roller 4.0. If you see anything funky, please let me know. As part of the upgrade, I did a bunch of spring cleaning, so it's possible I deleted some files I shouldn't have. As far as upgrading, the only issue I know of is this one where my categories are no longer in the same order. Since it didn't seem possible to fix easily, I decided to not worry about it and go ahead with the upgrade.
If you'd like to take Roller 4.0 for a test drive, you can use the Test Blog on this server. Username is test, password is roller.
I dig the new entries and comments counter: