Reader Gilles writes in with an interesting tip: You can use a keyword bookmark to quickly post something to Twitter from the address bar in any browser.
This trick works by simply passing the message as a keyword to a specially formatted URL. Once you've hit Enter to run the search, the Twitter submit page will be automatically filled with your tweet, ready to hit the update button.
To create this for yourself, add a new bookmark with a name and keyword of your choice and set the URL to the following—the %s will be replaced with whatever you type after the keyword in the address bar.
You can create the same thing for Google Chrome by right-clicking the location bar, choosing Edit Search Engines, and adding a new search engine with the same parameters. Thanks, Gilles!
If all the talk of keywords is new and confusing, check out our guide to Firefox and the art of keyword bookmarking.