Doing things like signing your name differently than the name on the checks may or may not do a thing - I've changed my signature and nobody's noticed, and at a previous job, the secretary messed up and accidentally gave two paychecks to the wrong guys (she didn't speak Spanish, they didn't speak English, and just nodded and smiled when she asked if this name was theirs). And neither of their banks even noticed, just deposited the checks as normal - luckily they had the exact same amount in their checks so nobody got screwed out of money. I have very little faith in that sort of thing actually doing much.

Mind you, I bank by mail, and when I mail in a deposit, I still don't actually endorse the check, but write "For deposit only into acct # [blah]" on the back.