Polyphony Digital has announced a new feature in Gran Turismo 5 which will allow you to upload data from an automotive data logger and recreate your laps within GT5. While technology currently requires the use of the CANBUS data along with a Denso GPS controller we can only hope that one day we might be able to use this technology with regular track day dataloggers. In the meantime check out this video of a Lexus IS-F lapping the Fuji circuit with its virtual recreation side-by-side.
Official blog of the Golden Gate Lotus Club