Ubuntu on all models where it works
I'm still throwing away copies of Windows. Recently I have ordered some Dimension 9200s from Small Business. All of these machines are running Ubuntu today without problem. They're being used to replace some PE400SCs that are starting to die. A 2GB quad core for $649 was too good a deal to pass up. It makes a great small server.
Please offer Ubuntu as a choice on all configurations where it works. I would have still paid $649 for the box and you could have kept the money you're sending to Microsoft.
We continue to explore different Linux opportunities on our systems. Check out daniel_j's comment below.
Ubuntu available on all home and small business laptops.