You can sell your XRP for 90% silver US dimes/quarters/half-dollars IOU's from this guy.  Also if you trust the Bitstamp gateway you can trade those against BTC or USD.  I have received 25 physical dimes and 2 half-dollars from TTBit, and just redeemed another few dozen that I expect to receive in a day or so.

I say this just because it's the most that I've really done with Ripple and I thought it was cool.  I have not seen a competitive market for trading USD and BTC, but it's another option.  If you got a bunch of XRP from the giveaway you can cash out into USD, BTC, and probably LTC, if you trust people/exchanges whose IOU's are being traded.