@Pistachio on Twitter gave me a great idea for a new Greasemonkey script. Twitter users know that putting the @ sign in front of someone's Twitter ID (e.g. @twitterID) is the way to reply to that person through twitter. When you're on twitter.com, or using a twitter client, this @twitterID is usually hyperlinked to that Twitter profile page (e.g. http://www.twitter.com/twitterID ). However, this is usually NOT the case when you view a Twitter ID on any other webpage (including Gmail). I decided to put together a Greasemonkey script that changes that, so that any Twitter ID, anywhere (even in Gmail) will be hyperlinked to the corresponding Twitter profile page.
Since I try not to reinvent the wheel when possible, I built my script on top of Jesse Ruderman's AutoLink Greasemonkey script. (I did delete some of the functionality that people might not want, such as bugzilla IDs and phone numbers – if you want the full version of that script, get it here. Note that you'll have to merge my Twitter filter into his script if you want the Twitter auto-linking functionality.)
Once you install the script, @rossruns will look like @rossruns. As an added benefit, Jesse's script already converted email addresses and plainlink URLs into hyperlinked versions, so you get that auto-linking functionality with this script, too.