Cool. I would pick it off and put it in some fallen leaves. That way it can find a place to overwinter. It'll probably die if it stays stuck in your door.

I've never seen a real praying mantis.

Do you have them in your area all the time, or is this just a "stray"?

We've lived here 3 years and I've seen several over the years. They've mostly been spotted on the south patio tho. I looked this morning and he's gone, probably into the garden which is only about 15' away. I'm going to watch and see if he comes back and if he does I will take him to the south patio. We had placed some large stones there and I think some of them may be overwintering there. I just read an article about them on the DG newsletter I get. Apparently they don't live as long as I thought.

Marric - What's the DG newsletter ?

DG stands for Daves Garden. The newsletter is free to anyone. I tried to post a link but Garden Web won't let me.