I found a great little list over at Freelance Switch.
http://freelanceswitch.com/humour/top-ten-signs-you-may-be-charging-too-little/
One of my favorites:
Number 6:
Clients pay your invoices in cash from their wallet.
Also check out:
http://freelanceswitch.com/humour/top-ten-signs-you-may-be-charging-too-much/
Number 9:
You’re still living off a job you finished in 2005.
