From Music Hack Day
Built using the Spotify Apps API, this app grabs the current song and attempts to find it on chordie.com, a guitar music website. If it finds a match that's valid (half the popular songs aren't available in the UK for legal reasons), it sends it back to the app, which cleans it up and formats it prettily, all inside the Spotify window. It'll respond to playlist changes too.
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 What APIs, tools or kit did you use?
Spotify Apps API. There's also a nice tool called simplehtmldom.sourceforge.net which I use for jQuery-esque selectors when screenscraping.