That's an interesting site, didn't know anything about it. My longer-term business plan involved something like that (
http://devtome.com/doku.php?id=development_exchange) but actually directed at the opposite non-core devcoin bounties and work, although I agree a more structured way to organise bounties would be helpful.
Another couple of things I've come across that were also interesting re. Devcoin angle:
http://ejohn.org/blog/gittip-at-khan-academy/ payswarm (cached - seems to have been subsumed in past week by web-payments.org which looks more about bigger picture Open Transactions perspective, although not sure how 'open').
Nice, I am by no means capable of pulling something like that off on my own, but it is interesting! I am going to keep moving forward with my vision of the bounty tracker for DevCoin as I see it, but I could see possibly integrating it with the exchange you mentioned as well. I will follow any developments you may have in that area! Great write-up too by the way!