Anand tests Thunderbolt on Windows 7. The sheer scale of bandwidth is incredible. One Thunderbolt cable can support a monitor and three external drive setups with bandwidth to spare. This would be fantastic for laptops. One finds many atrocious combinations of ports on portable devices. With Thunderbolt, only one port would be sufficient for many people. That would make laptops lighter and less power-hungry: a win-win! If more ports are needed, then just connect a 4-port hub.
Of course, it's not perfect. It's not market-ready. It's expensive. And almost nobody has thunderbolt devices. So, it'll take a while for it to hit mainstream.