I had a horrible mouse problem for years until I did this:
I bought about 50 stainless steel scrubbies (they look like a silver rose bud all coiled up when you buy them). I used leather gloves and pulled them apart until they were long multi-strand "cords" and stuffed that up under the bottom of the lowest piece of siding at the base of my house (where it meets the cement foundation).
Then I went back and sprayed a small amount of that expandable foam (it comes in a hair spray sized can at Home Depot). Don't use a lot because it expands a lot and can push out your siding.
I also looked for any other entry points, like around the gas pipe that enters the home at the meter, hose faucet pipe that enters the home, etc. I did the same stainless steel and foam trick. NO MORE MICE!
I did this about 5 years ago and I haven't seen a mouse, a mouse dropping, or smelled urine, etc since I did this.
Good luck! I know you wrote the question in 2012, but I'm very proud of my solution! And it's is cruelty free! No mice were killed in the making of this solution. :-)