[itafroma]

I agree that it does slow down brute force attacks (I did say as much in my comment: looks like I was finishing up the edits to my comment while you were replying), but not substantially, particularly when the password is already weak. The salts themselves are stored in plaintext, so while it prevents the ability to use prior work on future passwords, weak passwords will be compromised just as fast as if there were no salt at all.