[rdl]

I'd personally go with Coinbase (we're going to add it shortly), since they have probably the best API.

All of the Bitcoin options suffer from a long delay between "oh, I want to use your product/service" and "can pay", if your user doesn't already have bitcoin. As long as 5 days.

What I'd recommend, if you're selling a service, is to do a 15-30 day trial AND take Bitcoin (or give someone free initial service IFF they pay with bitcoin, if you don't do demo anyway), to give them a chance to get started immediately. Unless you're shipping a physical product, losing 5 days of service if someone's bitcoin payment doesn't happen isn't a big deal, usually.