Or just sell the same product through two different channels. Call it "Tarsnap" and make it work via a CLI and low-fi Web site for the geeks who appreciate such things, and call it "Super Secure Backup Pro XP" (or whatever name appeals to normals) with a GUI and a lickable Web site for the non-geek population.
Underneath it can all be the same product, just packaged differently depending on who the potential customer is.
Underneath it can all be the same product, just packaged differently depending on who the potential customer is.