I'm a recovering workaholic. To this regard I have decided to formalize my one man operation accounts receivable down to the following payment options:
1) Pay up front; I have no problem working on retainer.
2) Pay according to an hourly rate; currently
http://pegasus.cc.ucf.edu/~rami/playbook3) Pay according to whatever
http://pegasus.cc.ucf.edu/~rami/code/payd says you owe at time of payment*
*of course the interest set is based partially upon how nice you are