This project* aims to provide plugin functionality for Spotify. Spotify's client currently lacks support for third-party plugins. The goal is to provide an API between the Spotify client and plugins.
Right now this project is more of a proof-of-concept than functioning software. However, it does work and there is an API available. In other words, it's entirely possible to create something useful for Spotify right now.
Upcoming featuresNext on my to-do-list is to create a Last.fm-scrobbler. It actually is possible with the current plugin API. But to create a well-behaving scrobbler, it needs some extension (track length among other things)
When creativity strikes you, download the source code and see if there's anything you can do to help out. I'd really like to hear you opinion