All nice and dandy, but qemu is missing 3 major features:
A. Good graphics card support. (cirrus is dog-slow, std-vga is unaccelerated and vmware only semi-works on Linux guests).
B. Working SMP support for Linux guests. (Read: qemu-kvm should actually idle when smp >= 2 instead of eating 200% CPU...)
C. Accelerated VNC. (Hopefully Solid ICE/Spice) will be accepted into qemu. (SPICE supposedly has fully working Windows and Linux drivers that might also be used to solve A)
DEV: Intel S2600C0, 2xE52658V2, 32GB, 4x2TB, GTX780, F20/x86_64, Dell U2711.
SRV: Intel S5520SC, 2xX5680, 36GB, 4x2TB, GTX550, F20/x86_64, Dell U2412..
BACK: Tyan Tempest i5400XT, 2xE5335, 8GB, 3x1.5TB, 9800GTX, F20/x86-64.
LAP: ASUS N56VJ, i7-3630QM, 16GB, 1TB, 635M, F20/x86_64.