Thanks to my buddy Stewie, upgrading to 2.6 was a breeze. He suggested installing the automatic upgrade plugin, and it didn't disappoint. The process couldn't have been easier. On the upgrade page, just click through each step, and after about 5 clicks (and two downloads--the site and database backups), you're done. Wow! :yay:
Oh, and Stewie, Custom Smilies has been updated. The new version is here.