Just FYI, seeing this mining rig kind of inspired me (a while back) to see what would happen if I took a more modern FPGA - 28 nm technology (Cyclone V) and used it as a platform for BT mining. I wound up looking at the C5-A9 (which has 301K logic cells or is twice as big as the LX150's). Since it is a newer technology, I figure I should be able to run it at 250-300 MHz clock rate - and by putting two of the FPGA's on a card, the resulting performance should be around 1000-1200 MHash/sec (and probably at a lower power consumption since it's 28 nm technology).
Anyways we have a web site located at :
http://www.raspberrycoins.com/If we get enough interest, then we'll do a crowd-sourcing thing, and make some boards for sale.
The only issue is that ASIC miners are on the horizon - BFL has announced that they have shipped, and if you reconfirm your order, you'll get your product at some time. Naturally ASIC miners would render FPGA's obsolete (for mining purposes).
