As part of Manchester's Futuresonic 2008 conference, you can have your old CDs and DVDs "overwritten" with a vintage record cutter and converted to a 45RPM record:
Take part in a social music sharing event with a difference – in CD-Recycled 45rpm Aleks Kolkowski uses his vintage record cutter to 'overwrite' existing data and cut grooves on CDs/DVDs so they can be played on a turntable. Bring unwanted CDs/DVDs and a sound file and receive a recycled disc in return.
(via Gizmodo)