7 Day Spending Challenge

Bankrate has an article that proposes a challenge to you: Go 7 Days Without Using Your Plastic. Instead, set a realistic budget for the week, take out that much cash and use only that. You can read the end article here.

I am heavily dependent on my credit card, but stick to my budget, so I am unsure whether or not I am going to try this out. It might be a good experiment. Any thoughts? Have you tried something similar in the past to get spending under control?