Damaged Fonts -- Lloyd Lim <firstname.lastname@example.org> 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.
Option-Click in Scroll Bars for Jump Scrolling
In Mac OS X in general, and thus in most native Mac OS X applications, hold down the Option key and click anywhere in a window's scroll bar to jump to that spot (rather than scrolling one screen). If you like this behavior, you can make it the default in the Appearance preference pane. For "Click in the scroll bar to:" select "Jump to here."