A slightly esoteric tip, but very useful for the people who need it…
Jacob Rus has created a list of multi-stroke keybindings that allow for the quick insertion of Apple-centric glyphs like ⌥⇧⌘V or ⌥→ or ⌫ or, when all else fails, ⎋.
If you write documentation for applications or give advice on how to do things in Mail.app or any other Apple app or just prefer ⌥⇧⌘V to Option-Shift-Command-V, this collection of keybindings is for you.
After installation, it will work in any relaunched Cocoa app—ecto, Mail.app, TextMate, Yojimbo, WriteRoom, whatever.
Head over to the TextMate blog, where Allan Odgaard has posted instructions 
on how to install the keybindings in your ~/Library/KeyBindings folder.
