Closet telecommuters" or "guerrilla telecommuters" have only their bosses' permission to work at home. Perhaps managers' greatest fear about the "office-free" lifestyle is that "teleworkers" may be "teleloafing," but generally people put in longer hours at home than at the office, the "teleworkaholic syndrome.

It's a common reaction called teleworkaholic syndrome: the pressure to produce. It usually starts out with the telecommuters feeling excited and liberated to be working from home. They feel grateful and think they must always do more work.

That sense of accomplishment, however, gives way to the teleworkaholic syndrome, Fox says. Because they are producing more, and may view telecommuting as a perk, they feel they have to always do more work in order to justify their situation.