Cross posted from my work blog on this wiki.
Brenda and I stayed late last night to perform the upgrade, which would have gone very smoothly except for one little snag: Tomcat now requires an extra flag to enable SSL, but Atlassian didn't originally include this in either their code or their documentation. In response to someone's irate comment on the upgrade page, they added a reference to it in the docs (somewhat buried, to the extent that we overlooked it on repeated browsings) but still didn't update the code.
After adding the SSLEnabled=True flag, it worked just fine. Upgrade took 30 minutes, and troubleshooting the SSL thing took around 45+ minutes =(
The favicon for Firefox is broken too, and I have no idea how/what Atlassian did to jack this up. Now that I've got that fixed, I need to figure out why news posts are no longer showing up using the blog/display macro I have in some of the spaces...
Overall, it was a smooth and relatively painless upgrade, made much quicker by my having documented and outlined everything needed before we sat down to perform the actual upgrade. The bugs I've found are relatively minor, but they leave me scratching my head since these were things not broken in the last few version. Regression always weirds me out.