Laptops running Linux just might be the next big thing. Somebody has dedicated a site about getting Ubuntu Dapper (6.06 LTS) working on the new Macbook. The Dapper, once installed in the Macbook, run the following stuff smoothly:

• Video
• Direct rendering
• Sound
• Ethernet
• Basic keyboard functionality
• Basic touchpad functionality
• Advanced keyboard features
• Wireless
• Battery
• Firewire, USB2, Bluetooth
• DVD playback
• CD burning
• Booting via BIOS mode (often incorrectly called 'BootCamp')
  

Video out, remote control, and iSight have not been tested yet but the author expresses that there is a big possibility this stuff will work. Currently, the sleep, backlight control, advanced touchpad features, and EFI booting are not working.

For more information on the Ubuntu on Macbook development, just visit the website here.