Shameless plug here kinda..... One thing you could do is write a really good invoicing app that works with a decent GAAP accounting system, like LedgerSMB. If

Shameless plug here kinda..... One thing you could do is write a really good invoicing app that works with a decent GAAP accounting system, like LedgerSMB. If the system is ok, and the database underneath is solid, you can do the GAAP stuff without having to write a whole accounting package.