Exposé is absolutely fantastic! This is another great use for it.
“I select some text in Safari. I click and hold until it becomes draggable. Now I hit F9. All of the windows shrink. When I place the cursor over the desired TextEdit window, the cursor becomes a white circle with slash, indicating that I can’t drop there. However, a moment later Exposé brings that window to the foreground and I am able to drop my text. Elegant!”
From [Mac OS X Hints]
In fact you can drag your text to any text editor, even the weblog editor in NetNewsWire.