Remote Mapping as a career has potential. However, since most maps are tied to a particular software package (if it's not homegrown), you'd really have to have a diversified set of 'package' skills.
Some of the larger EDI/EC software providers actually contract out to "remote mappers". Basically work in your area (either on site or remote connect to THEIR clients).
Sterling, which manufactures the GENTRAN suite of products is big on that. So if you have experience mapping in Gentran (Unix or NT Server are probably the key platforms) then give them a ring.