You probably need to be a bit more specific. 🙂
What's your budget? What apps do you want to run? How big does the laptop screen have to be?
I'm inclined to suggest the MacBook Pro, if your budget is $2000-2500 (or $1800-2300 if you're a college/university student). True, you won't be able to fire up Counter-Strike on it without a dual-boot hack and the right drivers, but you can certainly fire up World of Warcraft or Quake 4. And they're certainly great for multitasking.