The only negative thing I have discovered about the homemade laundry soap is that there is no perfum-y smell to cover up ground-in smells. I don't notice a problem with this very often, but do occasionally have it with things like my gym clothes or Phil's work clothes which can get quite grimy and oily. The clothes seem clean, but those particular smells just tend to hang on where, with store-bought soap, the heavy scents would have covered them up. Have you noticed this problem? I'm not sure if I have it because I don't add any scents to my soap?
Anyway, the solution I've discovered for this problem is plain old baking soda from my kitchen cabinet. If I add 1/2 cup of baking soda to the rinse cycle of an especially smelly load, the clothes come out smelling clean. I know several of you have told me that you are making your own soap now, so I just thought I'd share this tip.