I've heard this as well so I whipped up a quick Ruby script that hashes a numbers of strings over and over, let it run for a few days on a quad-core machine and

I've heard this as well so I whipped up a quick Ruby script that hashes a numbers of strings over and over, let it run for a few days on a quad-core machine and found zero collisions. I tested MD5 and SHA-1. It may weaken the hash a bit but it also makes the algorithm slower which means it's harder to brute-force.