I haven't seen any chatter on the very recent news that Dell is going to be selling a model or two of PC's in Wal-Mart stores starting in June. This will be in Canada as well as the US. They will be custom spec models exclusively for WalMart. I'd say that's pretty big news for a company that has so far resisted any real retail presence other than a few mall kiosks.
I'm not normally one to break any tech news but I actually knew about this a few days ago. I now have a little birdie flying around the hallways there. :)
Unfortunately you can bet your first born that the models destined for Wal-Mart stores won't be the ones running Ubuntu. But then again, stranger things have happened. ;)