I haven't mentioned it in a while, but I'm still trying to operate on cash. I have jars, envelopes, and places in my wallet where I stash cash after I get paid. The interesting thing is that since I've been doing that, I've had a lot more money at the end of the month. I have added a couple of categories..i.e. my son's trombone lessons, etc.
I believe you really do spend less with cash. I'm not where I want to be yet, because occasionally I will use my checkbook for categories I didn't have enough cash for. But I'm getting better.
Have you tried cash yet?