Nice to see bitstamp support!
I'm looking forward to a time when the top 10 bitcoin exchanges handle no more than 10% of the trade each and meta-exchanges like bitfinex allow you to take advantage of the liquidity on all of them.
I'm really curious how you manage to have fiat on the right exchanges at the right time though, especially now that you are handling two third party orderbooks. Would you care to shine some light on that?