Back when MarsEdit could be bought as a bundle with NetNewsWire its license terms allowed a single-user to intsall a copy on several machines - typically a laptopp and a desktop. Since the sale of MarsEdit to Daniel Jalkut it is being updated and improved on a regular basis and I've started to use it much more than I have in the past. Alas, I can't find the current license text so don't know if I'm allowed to install/use a copy on my Mac Mini...