Tweetpkr: peek in on your Twitter friends from any site
The ability to check Twitter with one click, without changing focus, is more useful than it sounds at first. Each time you close and reopen Tweetpkr, it refreshes your list. That means no more jumping between tabs and hitting refresh, or winding up with a half-dozen Twitter tabs open. Privacy-conscious twitterers will also appreciate that Tweetpkr stores your username and password locally with the bookmarklet, not on its server. Oh, and multiple accounts are supported: just make a separate bookmarklet for each one.