Fancy a day at home? Tell your boss it's good for the planet
I've been doing a little bit of research on the environmental implications of telecommuting (as part of a bigger study). It looks as if working from home not only leads to a big cut in car use, but your house probably takes less energy to heat (and, more importantly, cool), and you start using local amenities more. So, provided daytime TV is not too much of temptation (quite the opposite in my case), why not bully your boss into giving you a day or two a week working in your PJs?
If you want a bit more detail on this, I've had an article published on Management Issues that summarises the findings.