Tim's The Door Is Ajar post has some right and some wrong, but I have to say the goal is a worthy one.  Unfortunately, I don't think his proposal will go anywhere even if everyone does it.  Wearing buttons don't stop wars and "Use a Better Browser" button will not make much difference.

What we need to do is build a pipeline into every Windows desktop to deliver new software and updates just like Microsoft currently can.  There will be some technical and social infrastructure that needs to be built for security and payment processing, but this proposal can void much of Microsoft's advantages in the desktop software market. 

New browser?  It's already there and ready to go with a single-click from the user.  Need to use a 3D modelling software for a week?  One click to turn it on, one click to turn it off, and an aggregated bill will arrive once a month.  Crazy?  Microsoft already has most of the pieces there to do this for Microsoft products as well as third-party products.