Things that I've seen come up in fannish discussion:
Redistributing my work via e-mail and other more private sharing methods is always okay so long as my name stays attached.
Saving stories/changing their format (ebook files, audiobooks, etc) for your own use is also always okay, as are translations. For that matter: if there's anything I can do to make this site more accessible, feel free to poke me about it.
Please ask before reposting my stuff (in full) to archives and other similar public webpages. I don't mind sites that convert to other formats/cache copies to reduce server pokings, it's just archivey archiving that I request you ask.
If I someday vanish from the internets along with this website, consider this advance permission to mirror my stuff on fannish archives (so long as I regain control over editing/deleting my stories should I reappear).
Don't make money off my stuff without asking first. Covering printing/server costs doesn't count as making money. Charity donations/causes do, but odds are very high I'll be fine with it.
Feel free to fic my fic, as it were—write things linked to it, use any OCs I have around, etc. You don't need to ask, though a link back/mention is highly appreciated.