How do I keep my outdoor trash cans from blowing away in the wind?
I've seen some houses near me have a sort of cage for them -- looks like a little fenced-off area on the side of the house, with the trash cans in there, and can swing open in front to get the trash cans out.

If it's really windy, you might need to add a top to it, so the trash cans can't lift out in high winds.