I use a PC program in Parallels that was the precursor to Accountz to handle Treasurer accounts I operate. I looked at Accountz when it was first released, but wasn't impressed. Maybe it's better now. I decided to stick with their old Personal Accounts software as (a) it works for me, and (b) a PC package means I'm more likely to be able to engineer an exit when I want to give up these treasurerships.
I have heard good things about Mind Your Own Business (MYOB) in the past. It is/was a Mac-native application, and probably covered most of what is needed in a small business, but it looks as if it has been subsumed into Mamut Software now. Maybe their AccountEdge product
is an option?
Demon since forever, HomeOffice MaxDSL since 2006 via Netgear DG834G router
Mac Pro 2.66GHz 4GBytes / MBP 13" - Snow Leopard plus Centos4 & XP Pro in Parallels