Installing vmware creates a bunch of devices in /dev/ on installation. These devices are used for virtual networks (vmnets). If you're running udev, these devices will be created on install, and then the first time you reboot, they'll disappear.
for i in $(seq 0 9)
do [ -e /dev/vmnet$i ] || mknod /dev/vmnet$i c 119 $i
That's the little bash script you have to run as root to recreate those devices if they don't exist. I couldn't find this little gem anywhere, so I'm recording it here for future generations of vmware users.