My entire house is nearly converted to Macs. Me with 2, and 4 others with 1 each.
All 4 gradually saw the light. 2 got G4 towers (at the time) because that's what school was using (music mixing). 2 other got powerbooks. One uses a PC still but only for gaming and chat. And another is suffering through a crappy PC laptop and will get a PB this summer. I will have converted 5 people in the last few years.
Not to mention iPods...