The last time I telecommuted [1] was in January-February of '96. I had just lost my car in the middle of Georgia (halfway between Christmas and New Year's Eve, on a Saturday no less!) so I was more or less forced to telecommute until I could find a car.
I was, oddly enough, the most productive I've ever been at work [2].
Then again, there wasn't much else I could do, being without a car at the time.
[2] http://www.conman.org/people/spc/refs/search/search.hp1.html