Title says it all.

Steam Workshop has a "mod subscriptions" framework for auto-updating mods. I'm not up to maintaining subscription auto-updating for my mod.

TES Nexus is another popular site, but I have heard bad things about them a few months ago, something about various mods being infected with malware. It might be cleared up by now, however I'm not trusting TES Nexus just yet after that fiasco.

tl;dr; anyone know any good popular mod hosting services for Skyrim mods besides Steam Workshop and TES Nexus?

http://tesalliance.org/forums/
http://www.darkcreations.org/forums/
http://www.theassimilationlab.com/forums/

http://afkmods.iguanadons.net/

Probably others, but these are the major ones that cater to TES modding - that I can actually link to here