You can use it as an electric heater to warm up your house during the winter.
Its 620W power usage happens to be a good value for that purpose. Unlike BFL asics that with their 100W wouldn't be that good at that.
And you will still have the nice feeling of being contributing to the bitcoin hashing network.
Another advice: when the difficulty will get so high that you will no longer care about the income, switch to solo mining. At least you will still have a chance albeit slim of paying off your investment.
I switched to solo mining with my 335MH usb miner precisely for this reason.