Last.fm allows you to export your scrobbling history, but you can't do much with them on their own.
This is a rails app that can import that data and provide an interface to explore it
Install dependencies with bundle install and run with bundle exec rails server.
It comes with some example data, which you can load with rake db:fixtures:load
First, export your scrobbling history, extract the download and find data/scrobbles.tsv.
To import that data into the application run:
bundle exec rake import:from_tsv USERNAME=yourusername PATH=/path/to/scrobbles.tsv