Waiting for him to call?

I went on a date with a guy and thought we hit it off pretty well. After I got home, I emailed him letting him know that I had a great time and I hope we can hang out soon. He replied by telling me he had a good time and he would call me next week. That was almost a week ago and I still have not heard from him. I realize that he works and everything, but I just wish he would call! If he sent me an email and said he would call me - he must have had a good time. Right? And he is going to call.? Any suggestions on this? What "rule" do guys normally follow when how long to wait until they call a girl
Waiting for him to call?
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