Newsgroups

Sadly, there is no newsgroup for Homicide fan fiction, but there is a newsgroup for Homicide! (Don't even try to post fiction there, they'll rip you limb from limb!) I wouldn't suggest going to alt.tv.homicide without having read the FAQ, though.

Fiction newsgroups abound, though. Read the FAQ for each group before posting; each group has its own specific format requirements, if they accept fiction at all.

alt.writing
alt.fiction.original
rec.arts.prose

If you plan to crossover into ER, Sliders, Star Trek, Quantum Leap, The X Files, SeaQuest or Due South, there are groups for those stories. (Make sure to READ THEIR FAQ!)

alt.tv.er.creative
alt.tv.quantum-leap.creative
alt.tv.seaquest.creative
alt.tv.due-south.creative
alt.tv.x-files.creative
alt.tv.sliders.creative
alt.tv.star-trek.creative

Personally, I'd stick to realistic or established crossovers, like ER, The X Files, or Law and Order, but that's just my 11 cents.