So how does the marketplace for used FPGAs compare to that for used video cards? Is there some repository of working code for the various FPGAs? I ask because the codebase for GPUs is pretty small and specialized.
The market is smaller, even though FPGAs are less specialised than GPUs, but only because GPUs are so widely used in gaming. It's not that hard to find used FPGAs for sale on the Internet as well as code examples, mostly for Xilinx FPGAs. I dunno about Butterfly Labs though. I can't seem to find any information about programming them, which to me suggest there's something very wrong here... Probably best to stay away from Butterfly Labs if you're worried about resale value.