Vienna Plugin for Tweetie
Vienna 2.5 comes with a Twitter plugin already installed as an example. This example uses the link plugin style which launches a webview where you access your Twitter account. This is a great example and will work for many. For my purposes, I prefer to use the excellent Tweetie application. Tweetie has a build-in url-scheme that you can use as a bookmark in your web browser or, as I am about to show, from an AppleScript.