This Greasemonkey Firefox add-on runs on the main Twitter home page, on the Update text entry box. Continuously checks for new URLs as you type. After you press space bar following a new URL, this script instantly replaces the URL with a bit.ly tiny URL. This script will act on any non bit.ly URL it finds in your Tweet. Only 3 clicks/key strokes total: 1. select a URL, 2. copy, 3. paste it into your Tweet. Twhirl needs 5 key strokes to do the same thing.

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Whenever you visit the Twitter homepage you’ll see an extra banner at the top of the page with your search...