Hehe, thread starter should post his/her opinion first...
I don't know so much commercials, as I have habit of leaving tv immediately for those minutes, when commercial break starts, as these days it is so long, that in this time I easily can do something other useful (wash dinner plates, let my dog out, brush my teeth, check the Forums...
But I can tell the most annoying themes in general: it is advertising washing powders, all kind of cleaning creams for surfaces and carpets, all hygienic products starting from "wow, my hair is twice as long after this shampoo" etc.