"Get more Spotify music recommendations, based on your favourite tracks."

"Which Spotify Do I Need?"

Uses last.fm for the recommendations.

"I put together an app that gets the Top charts from Billboard (using the nifty Billboard API) and resolves them to a Spotify ID – giving you a top 100 chart that you can play."

Suggests albums from the Spotify catalogue.

Provides updated playlists for the US Hot 40 and UK Top 40.

List of Spotify applications, plug-ins, news sites, playlist repositories, etc.