A number of things that do not work out of the box:
Internal Broadcom 4318 Wireless
Suspend and Hibernate
SIS M760GX Integrated Graphics
2 Quick-launch buttons: "P" and "e"
3 Fn Shortcuts: F2, F3, and F5
Out of these things, you can only fix the wireless. I suspect the F5 shortcut will be fixed in Ubuntu 7.10. As to the other buttons and shortcuts, they probably don't work because there is no obvious meaning to them, but this might change if developers chose to implement the functions found in the manual.