An interesting interview with Linus in the NY Times (free subscription required):

Q: You gave Linux, the operating system, to the world free, in effect jump-starting the open-source movement. Now this previously obscure company, SCO Group, claims ownership of some of the code and threatens to close the door on open source and Linux. I suppose it's to be expected that when you send your offspring out into the world, you have to be prepared for your kid to run with a crowd you don't approve of.