Annoyed that the font from your favorite sticky app or website is carried to and from the clipboard?

Use ⎇⇧⌘V instead of plain ol ⌘V for pasting.  It requires loading a new muscle-memory config into your brain, or you can use the keyboard pref pane to map “Paste and Match Style” to another combo.

UPDATED: That first glyph refers to the Option (sometimes labeled Alt) key, so the full keypress is Option-Shift-Command-V.