Sometimes even the best intentions of developers can't account for user preference, and after speaking with many other Mac users, this certainly seems to be the case with OS X's habitual tendency to preserve the formatting of text copied to the clipboard. For example:
I copy text from OmniWeb:
Pasted text before running the trigger:
Pasted text after running the trigger:
Quicksilver maven Dan Dickinson has figured out a sneaky way to strip out this formatting, and has turned the method into a handy Trigger. The trick works by pasting the contents of the clipboard into a terminal shell (where it loses all formatting), and then re-copying the text to the clipboard. For the trigger to work, you must have the Terminal Plugin installed. A full how-to is available on Dan's website.