Its pretty crazy that there is not a draft Generic Collaboration Agreement floating out there. I don't practice IP Law or Entertainment Law but I could create something pretty generic which would be helpful. I just need to look into all of the liability issues when you draft legal forms like that.
I would also suggest trial or free versions of Echosign or Docusign for electronic signatures. You can email the agreements to people, they sign then you sign. It's digital which puts a little bit of a cloud over the effectiveness of the signature but if you put in a clause digital signatures are valid means of executing the agreement you should be ok. A basic tenant of contract law is that the method of accepting a contract can be set out by the parties. Also, I don't think a judge would dismiss a case if the defendant admitted that they signed the agreement but their only defense was the fact it was electronic.