According to developers with access to the latest pre-release distributions of Snow Leopard, the OS now includes CoreLocation, which is the same framework that allowed the first iPhone to roughly triangulate its position without a GPS unit. That should open the way for some cool iPhone-like apps on MacBooks and MacBook Pros... perhaps even ports of stuff like recipe and friend finger applications that have gone over so well. Good stuff. Considering GPS chips were as inexpensive as $5 two years ago, it wouldn't be terribly surprising to see a GPS-equipped MacBook in the near future.
Apple's Snow Leopard to Include Location Multi-Touch Tools [Apple Insider via Gadget Lab]