Damaged Fonts -- Lloyd Lim <email@example.com> says that a good check for bad font files, along with other files with resource forks, is to run John Norstad's excellent virus fighter, Disinfectant (now at version 3.2, see below), which checks for and reports damaged resource forks. It may not catch all types of damage, but it is a useful troubleshooting tool.
Open URLs Quickly from BBEdit
If you're working on a bit of text (HTML or otherwise) in BBEdit, and you see a URL that you'd like to open, the fastest way is to Command-click it. Most BBEdit users probably already know this tip, but if you don't, it's a huge time-saver. (The same trick works in BBEdit's free little brother, TextWrangler.)