The problem I have with your merchant system is that your site is extremely slow processing bitcoin deposits.
Often it is 1 hour or more, and mybitcoin did it in a few seconds.
Yes I realize the risk in this, but the services I sell are time sensitive, I cannot hold it for an hour to see if the customer pays or not.
It would be great your API could instantly tell me when a payment is received (even if I have to wait for it to be confirmed in block chain before I can spend it).