There is a campaign to make sure the "Secure Boot" feature of UEFI (which is starting to replace the BIOS in newer x86 motherboards) does not prevent running free operating systems.
There are already almost 20,000 signers.

The campaign can be found at
Canonical also have a statement at
Some good information can be found at
There was also a post on earlier this year. see

If you care about free OSs, you should really sign the statement to show your support. Hopefully is achieves something.