One the consumer end, I've had good luck with the Cables to Go brand of VGA/DVI + USB KVM's. Make sure it comes with cables, that's half the cost of 'em it seems.
Haven't had any experience with the Fleabay cheap Chinese ones.
On the enterprise end of things, I've got a Norco one in my rack similar to the linked one above that works a treat, but it wasn't cheap.
http://www.kvm-switches-online.com/
