Escape from QuickBooks (with data in hand)

I had similar issues with MYOB, but found that (at least at the time) their ODBC driver and API access is only available if you're signed on to the MYOB Developer program. And they get to tell you if they don't like what you're doing with it.

It's also read-only except for specially authorised devs, so useful for export and reporting but not integration.

Sigh.