I am in need of a billing software that is capable of using most gateways eg, ibill, instabill, revecom(specially). I need it to be a decent price, the main features are:
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Automatic billing (and account creation if possible)
Clients able to edit payment information and view an invoice
Well designed layout and interface
Easy to add components to the script, eg domains etc
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Regards,
HostEXP

Someone in here was creating one as we speak, i forget who it was ill find out..

The guys at Voxel.net have developed a pretty cool billing management / ticketing system called Ubersmith. I am on the beta system right now and it looks and works great! I should be going live with customers on it in a few weeks. Check it out at:

http://www.voxel.net/projects/cbms/