Writing a Contract for GPL'd Code?

An anonymous reader wonders: "I am working as an independent developer for a client I have a long relationship with, and of whom I used to be an employee. I've made informal contracts in the past for development work, but this job is much more significant. Also, the client has gone to court over software development in the past; he was in the right to do so, but I need to cover myself. The product will be released under the (L)GPL and copyrighted by me, and the client will also be agreeing to open the license and give me the copyright on some code I previously developed. I plan to consult a lawyer, but I just want a little more direction before I start investing hours. Are there any resources I should know about, beyond what the FSF has to offer?"