PS: Full disclosure: I'll be paid a one-time fee of $3,000 to cover expenses and pay me for my time. I don't want any "Gavin is on the CIA's payroll" rumors to get started, either...
I consider a free software successful when some people start paying others to work on it/work with it (aka Free Software consultancy). Linux, in that regard, is highly successful. My day job is also related to successful free softwares (GTK+, libreoffice,
).
For the record, this one seems to be the first paying contract for some bitcoin work. Which is really nice for the future of bitcoin :-)
Congratulations!