I'll second Freshbooks. I have been using them since 2006 to send out monthly invoices. Most of my clients still pay by check even though they can pay with a

I'll second Freshbooks. I have been using them since 2006 to send out monthly invoices. Most of my clients still pay by check even though they can pay with a credit card online. Freshbooks is super cheap for what they do and I don't have to worry about getting bills out every month.