UPDATE:
Last night (3/14/09) we had a visitor at approx. 10 PM.
We were watching Get Smart and it was during a part where there were in a peasant village. There were animals making animal noises and one seemed more prominent than the rest. I remember thinking, "That's odd. Why would they have meowing as part of this scene." At that point I looked towards our back door and I saw his curious little face peering through the glass.
I turned to Jill and said, "I think we have a visitor at the backdoor".
After and 8 day hiatus, Frederick is home.