Tomahawklet is a bookmarklet that scrapes sites for songs, generates and stores a xspf on tomahawklet.com and sends the xspf into Tomahawk (or lets the user download the xspf). 

User Install
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Drag bookmarklet link on http://www.tomahawklet.com to browser toolbar

Bookmarkable Sites
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Last.fm - any page with songs
Musicbrainz Releases
Groove Shark Playilsts (export, next step on song list page)
Rdio
Mog
Fiql
Apple
YouTube (Disco)
more: http://www.gettomahawk.com/ecosystem/tomahawklet

Players
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Playlick http://www.playlick.com
Spiffdar http://spiffdar.org

Development
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Tomahawklet is a Google App Engine Python application. If you would like to deploy your own version, sign up to Google App Engine (http://code.google.com/appengine/) and edit the app.yaml file with your settings.