I have power bars and the like fitted with GFCIs: if the power goes out, the GFCIs need to be reset manually. I realize this couldn't be universally true, or else the outlets in the bathroom would have to be reset every time the power went down. But the ones I have built into power bars always have to be reset.
This actualy was always a pain, as I bought these things to use with my salt water aquarium. If the power went out, I really wanted all of the electronics to start back up as soon as possible. But until I was there to reset the GFCI, my poor fish had to suffer.
Chad