We’ve recently covered about LongURL and LinkPeelr Short URL Expanders which helps in knowing where short URL leads to in Twitter, Xpnd.it is similar short URL Expander from LongShore for Firefox auto magically scans and analyzes any short URL which helps in avoiding clicking links to malicious or phishing pages.
Longshore currently supports close to 600 URL shortening services. LongShore offers URL shortening service sqze.it . So LongShore offers shortening long URLs as well as expanding short URLs.
Xpnd.it works with Firefox 2.0 – 3.6.