If you have more than one machine on your home network (especially if they don't all belong to you) and all users are vigilant about running Windows Update, you might want to be able to check and see how vulnerable their machines are to attack. This freeware allows you to check the status of patches on the machines on your network. If you pay a fee you can also that enables the push down of patches on other machines on your network.
Network Security Scanner & Port Scanner