I think it would be a great benefit to sell downloads at gigs. I buy a lot of bands CDs at gigs, which I then have to convert to MP3 to put on my ipod; it would be much better if I was to buy a voucher at a gig that I could redeem as an MP3 purchase from indiestore.
The way I imagine this working would be with a unique code, which relates to a specific track or album on my indiestore... like when someone buys via mobile phone. The code could be on a flyer which I sell at my gig, and when the track is downloaded the money is deducted from my paypal account.
It would be a great way to drive traffic to indiestore, if bands were to do this rather than sell CDs then MP3 sales would be more successful at our level.
http://www.indiestore.com/jellyslastjam