The part about this that interests me the most is that it makes the Bitcoin protocol more understandable. The code is very readable and it contains a lot of comments.

Awesome library, but I'm a bit worried that they chose to implement their own crypto(mostly ECDSA), instead of using an existing implementation known to be correct.

I wish there was a comparison in the performance benchmark. What was its purpose if we cannot compare it to the mainstream Bitcoin software's performance?

looks nice. I wonder when we will be able to see a real type safe BTC exchange

How long did this take to write? How large is your team?

I guess the name is understandable since it is an implementation of a protocol in Haskell. But I wonder if the day Haskell becomes a mainstream language is the day when few of the apps and such built with Haskell aren't play on words or references to Haskell terminology. :)

80 columns - I'm surprised to see this honestly.