Do I need to get a signed release?

[arthur]

I photographed a cyclist among many other cyclists at a public race. I'm selling him digital files.

I was thinking that maybe I ought to have a signed release saying that I retain ownership of the images, but that he can use them for his own personal use.

Are there boilerplate forms available somewhere?

[csfbphoto]

To cover yourself... YES!!
Check the forum for sample/format for releases.