I see Apple ads almost once a month in Newsweek, as well as the iPod ads all over TV. For a while, I was really getting sick of the iPod ads all over TV (MTV, Comedy Central, ABC, NBC, CBS, etc.).
Plus, their partnerships with hp (seen plenty of hp iPod commercials), Pepsi (one word: SuperBowl advertising) and U2 (Bono's iPod ad) are all over the place -- predominantly on TV. In addition, the "big-big" markets like New York, San Francisco and Paris feature big, colorful Apple advertisements on bus stops and the sides of big buildings.
Whenever Apple makes a big advance in computing technology, like with the G3 (Pentium snail & Pentium guy getting burned TV ads), G4 ("classified as a weapon" TV ads) and the G5 (guy blown through the side of his house TV ad), Apple advertises the hell out of it for a short period, and if you're a regular TV watcher, it's almost impossible not to have seen one of those ads on a mainstream channel.