I posted this already, but the database issue caused it to get lost. The first part is sort-of reduntant now, but I'll include it.
There used to be a set of rules here on the forum that said, in a nutshell, on the subject of fanfics, don't. We don't want Jim to have to get the lawyers out, and he would have to.
That's the first part. Having said that, if you ever get the chance to meet Jim, ask him about fanfics. This'll work particularly well if he's in front of a crowd. He'll tell you the official story, but trust me, the way he does it in person is funny enough to be worth the effort!
It was in Toronto, anyway, and I doubt it would be different anyplace else...