There is an other FPGA Board at
https://bitcointalk.org/index.php?topic=49180.
The Board currently achieves 190 MH/s on a single Spartan 6 XC6SLX150-3. For amounts of 5 or larger it is cheaper (i.e. more MH/s per $, see
https://bitcointalk.org for volume discounts) and it is about 50% more efficient.
The Software is Open Source, see
http://www.ztex.de/btcminer an reached a mature level. A cluster mode with hot-plugging allows to run many FPGA board from a single software instance.
Boards are available immediately.
I don't think it's fair to say that your
board achieves greater MH/s or efficiency. The board design should not impact this, and both of our boards use the same FPGAs. At $/FPGA, our X6500 has you beat ($290 vs. $460). In addition, nothing is stopping an adventurous user from running your code on our board.
On the other hand, if you really have achieved 190 MH/s on this FPGA, kudos to you!