My sun desktop is instant on. We are using SunRay workstations. I put my smartcard in and my desktop re-appears.
The really cool thing about this is if I want to share something with my co-workers. I walk over to his cube, ask if we can swap smart cards for a moment, and instantly, my desktop is on his workstation.
Of course, we have a pretty beefy Ultra-Enterprise 5500 serving up the desktops
http://www.sun.com/products/sunray/ TB
