I particularly like the ads for the Xpressmusic phones:
http://www.youtube.com/watch?v=GC0ZXvtXxG4
http://www.youtube.com/watch?v=GZ1D0kY1b9U

The 3220 probably the phone with the best light notification system:
http://www.youtube.com/watch?v=j7LyKhwASeo

And finally the n82, my first nseries phone :
http://www.youtube.com/watch?v=v4i5NttcRuU

But I think that some nokia ads take themselves a bit too seriously...