Travel tip for Canada/USA folk: take along an ordinary 2-prong household extension cord with three outlets. Then get a single plug adapter for use with the extension.

Plugs in B&B's and hotels tend to be in inconvenient locations, and few and far between at that. Having the extension cord with three outlets solves both problems.

And with most such cords, even a three-prong plug device (eg. notebook charger) can usually be connected using the "end" outlet on the cable.

Cheers