PS: I once got stiffed for $6500, so I put up a "client hasn't paid" notice on the (demo) website for my code. I later learned that the guy I was accusing of non-payment was very likely a stolen identity. Some guy from Eastern Europe was using many fake identities and scamming lots of developers. So I ended up:

1) out $6500

2) feeling dumb for getting cheated in the first place

3) feeling bad for having pseudo-publicly excoriated a likely innocent

I wish in retrospect that I had taken the higher ground, open-sourced the code and just moved on.