Gear demonstrates how to quickly force open a padlock using a pair of nut wrenches, which could be useful in situations where you lost the key.
Safe Home Security Tips - lots of good ideas here and most appear to be pretty simple to do. From The Family Handyman.
11 types of keys. Please, replace your household locks with bump proof locks. They sell them at any home improvement store and it will keep anybody from using a bump key and walking into your residence
How to Make a Bump Key. I will probably never do this but it is interesting.
A Visual Guide to Bumping Locks | ACE Hackware