The 100 Best Companies to work for article of Fortune Magazine stated that Republic Bancorp (now Citizen's Bank) allows almost 60% of it's employees to regularly telecommute. But if you look at their job listing, you would never know it because they don't list it at all.
It goes to show you that there are A LOT of hidden telecommuting jobs out there. And the folks that have telecommuting jobs don't always advertise them. You must do your research . . . look up companies, ask friends, ask the company. Apply to jobs like you would "regular" jobs because after all, it IS a regular job that allows you to do the work in another location.
Some other companies that are open to telecommuting
SC Johnson - 23% employees telecommute regularly
Morrison & Foerster - 30% employees telecommute regularly
(Look for: Office Location Flexible)
American Fidelity Assurance Company - 33% employess telecommute regularly