What to do with old domain names?
I recently looked over my list of domain names and there are a lot in there that I no longer use (either due to me shutting the sites down or due to the domain names being for projects that never launched). I could let them expire or perhaps even sell them, but I'd rather not have the domain names fall into the hands of spammers (if at all possible). How do you handle old domain names? Let them expire? Sell them somewhere? (If so, where?) Hold on to them indefinitely?