Scan Computers is touting a new PC specially designed for project managers, but it looks to me like an absolutely standard PC with a special software bundle. What I'm interested in is a “collaborative” form-factor: support for two external displays, two keyboard/mice, a digitizer for sketching... Actually, you could build this from a Tablet PC ... Put the Tablet in slate mode, add your keyboards and mice with USB, split the video out to two external monitors (or send it to a projector). I think that would be an interesting way to program.
I read somewhere recently about guys using Remote Desktop Access to a shared workstation that was inches away. Can't find the link, but this gives an idea.