I haven't used Xero (xero.com) for a SaaS business but their accounting webapp is quite solid and customer support has always been incredibly helpful. They als

I haven't used Xero (xero.com) for a SaaS business but their accounting webapp is quite solid and customer support has always been incredibly helpful. They also have an API if you're looking to possibly programmatically add transactions: http://blog.xero.com/developer/api http://blog.xero.com/developer/api