If you have a mounted TV- you MUST do this! No more excuses! How-to: Mounting TV to wall with no cords showing. This is a good idea if you will keep your tv in one place permanently, as aren't renting, etc.
Diy Cardboard Slide ~When I was a kid, we did this! ***One improvement: make the cardboard about a foot narrower than the stair width, so that there is space for the kids to climb up on the stairs rather than the cardboard slide.