Complain to ebay, and also Paypal if that's how you paid. They will sooner or later contact him and if he doesn't send the items he'll likely lose both accounts and of course your obligation is nullified. Ebay is apparently fairly vindictive about sellers backing out of such deals. You can also threaten a dreaded Negative Feedback, recent ebay policy changes do not permit him to give you a retaliatory negative.
Be sure all communications with the guy are through messages sent on the ebay web site, do not use normal email since ebay will not be able to keep track of the exchanges.
I had a similar problem with a computer purchase, I recovered my payment through Paypal with relatively little effort and the seller was suspended (though doubtless he re-emerged under a new name).
[font="Comic Sans MS"][/font]Cheers, Bill!