I know, I know, usually articles are about doing things with style, but this one is different.
How many times have you wanted to copy and paste a clipping from a web page into an email, but found that when you hit command-v your nicely formatted email is suddenly full of purple 16-pt Times Roman text? Doing a command-c, you see, copies the both the web page's text and the style in which it's formatted.
I used to keep a plain TextEdit document around for just these situations, doing a quick paste/select all/copy just to lose the clipboard formatting. But now it's goodbye TextEdit, because many of the new applications in Leopard and in iLife '08 now sport a "Paste And Match Style" Edit menu item.
Choose it (or type the finger-bending command-option-shift-v) and your pasted text will automatically pick up the style at your document's insertion point. This tip works in Mail, TextEdit, Pages, Numbers, and Keynote.
Try it, and soon you too can be style-free.