So @
spotify have released a new version of their desktop based application that adds a stack of social features.
One of these is a user profile which displays your playlists, aswell as your top played artists and tracks.
I created a simple Wordpress plugin that enables you to easily add a button in your sidebar that links to your Spotify profile.
The widget has two options – one for your username, and the other for the text you wish to be displayed on the button.
Extract the zip file and just drop the contents in the wp-content/plugins/ directory of your WordPress installation and then activate the Plugin from Plugins page.
You can then add your Spotify username and link text within the widget control panel.