Would there be interest in a BTC bonding service? As in, a deposit is paid by BTC professionals or sellers, then a small monthly maintenance fee is paid. If they fail to deliver goods and/or cause damages of some sort while performing a service and then drop off the face of the earth, remuneration can be paid from the bond. Just like any sort of professional liability bond, only specifically for the BTC community. I've got a pretty decent idea of how this would easily operate, though I'd probably have to get some people better-known-than-me to be involved to give it some legitimacy.
I haven't seen anything like this, only per-transaction escrows, which get expensive if you do a lot of trading. This could seriously cut down on that sort of expense.