I listed my cards on craigslist for sale but the market seem to have no demands for these GPUs anymore. What are you guys doing with it?
Mining altcoins, with CryptoSwitcher deciding which to mine (currently mining Grandcoin with a 6870 and a 7750). It also handles trading altcoins to Bitcoin.
CryptoSwitcher can also be used with ASICs to switch between different SHA-256 coins. My Jalapeños are currently mining Terracoin. There's usually not nearly as much difference between SHA-256 altcoins and Bitcoin as between scrypt altcoins, but there is still a difference. Right now, Terracoin mining makes 108% of what you'd make by mining Bitcoin. Grandcoin, OTOH, currently makes 711%. That's a pretty potent multiplier; it makes my 470 kH/s of GPU power roughly equivalent to half of a Jalapeño.