Just ran across this site today and it looks like an interesting online billing solution. They have Authorize.net and custom gateway interfaces, recurring billing, etc. Monthly fee is very reasonable. They dont' look like a third-party billing outfit but seem to focus on hosting your customer data and interfacing to an existing merchant account.

A search here turned up nothing, but maybe some folks might have an opinion/experience to share.

http://www.billingorchard.com

I have used them and can highly rcommend them .. I set up a deal with Craig the guy behind it and offer it to all my resellers now as a billing solution for their use.

I just signed up for a trial account. I'll play around with it for a while.