Have MacBook Pro laptop and Ubuntu Desktop. The Ubuntu machine used to be dual boot, but have nuked the windows partition. The Mac has Parallels on it with XP for the occasional times that I need Windows: QuickBooks online is IE6+ only and that what my company uses for finance.
Elsewhere in my family:
Son has 12" G4 iBook
Wife has 14" G4 iBook
Sister has 20" G5 iMac
Her hubby has 12" G4 PowerBook and a cheap HP laptop running XP that he takes on deployments so as to preserve his Mac(he's in the Nat'l Guard)
Brother has 15" G4 PowerBook and 17" G5 iMac
Mom just bought a new MacBook and retired her emachines XP desktop, which my brother plans to install linux of some sort when he gets a round tuit.