Gutted. How did you pay for it? If you paid by Paypal then you can do a chargeback on him and get your money back, provided he hasn't emptied his account.
*EDIT*
I just had a look at the auction you won:
http://cgi.ebay.co.uk/RED-SNAPPER-HO...QQcmdZViewItem
that seller has probably not done a bunk, looking at his feedback - I would guess that he may have gone on holiday or is away for some reason.