I've created a plugin for foobar2000 v0.9, it stores all your plays in a SQLite database.
In addition to storing details on every play, the time and duration, this plugin automatically scores every played track. It uses a formula similar to AmroK scoring with a range of 0-100.
You can access the score for each track via the %score% title formatting string.
I'm hoping to create a viewer for the database so that you can see detailed trends as every play is stored in the database.
Here are the downloads,
foo_playcount_db v0.4
Binary (253KB)
foo_playcount_db v0.4
Source Code + Binary (1.31MB)