Don't you hate it when an application becomes unresponsive and crashes? Are you even more tired of reading annoying application crash dialog boxes? A simple Terminal hack allows you to never see these dialogs again. Just open Terminal (Applications > Utilities) and type:
defaults write com.apple.CrashReporter DialogType none
This will disable the "...unexpectedly quit" dialog that normally appears when an application crashes. If you ever want the dialogs to start appearing again, just replace "none" with "prompt".
Like tips like these? Try out TUAW's Mac 101 and Terminal Tips sections.