Are there any services online that combine Bitcoin with David Chaum's blind signing protocol?
I do know of one http://blindbitcoin.com/
The thing is, me and a group of friends intend to start one, based upon Open Transactions, and are quite willing to cooperate with anyone who already works on marrying OT and bitcoins

P.S.:
I've made a similar topic while being in the newbie containment and asked a mod to throw it in general, but apparently general discussion did not pay much interest to the subject, so I humbly submit the question to the attention of the D & TD subforum.