Dubious Distinction: Comcast
As pretty much anyone in the Bay Area knows, Comcast labels itself as a 'different kind of cable company.' And it needs to try to make that distinction, since it's following in the wake of (and using the same plant as) TCI's legendary low-ball infrastructure build-out, and AT&T's refusal to take responsibility for pretty much anything that happened on their system. Cable has been bleeding customers for years around here - every home on our little cul de sac has a dish.
Considering the nature of Silicon Valley, naturally Comcast has been promoting its cable modem service heavily. Unfortunately, someone forgot to give their ISP marketing and legal crew a clue. Via the Prof, we find that Comcast is cutting off customers for overusing their 'unlimited' service. There's nothing necessarily wrong with defining and charging for different tiers of service - that's a competitive issue - but there's definitely something wrong with telling someone they're buying one thing, and then delivering another, particularly when the change in terms is not even defined. Why, one might even think that instead of actually installing the equipment necessary to implement real tiered service, that they were instead resorting to FUD and misrepresentation!
Comcast has a serious fight on its hand to control customer churn in the limping systems they picked up from AT&T/TCI, and to make some inrounds on those customers lost over the years to satellite. Of course, Comcast's business extends well beyond the Bay Area, but that's the point: all of their current and potential customers can now talk to each other. Pull something bogus in one territory, and the word will quickly spread, undermining the marketing position everywhere.
For bogus implementation and marketing myopia above and beyond the call of duty, Comcast is awarded Due Diligence's mark of Dubious Distinction.