During these cold weather months it's nice to have boots easily accessible in the closet. A good way to keep them standing up straight and in an orderly line is to use boot inserts. Inserts help boots retain theirs shape and prevent them from flopping and toppling over into an unattractive pile.
You can find boot inserts at various places including here and here. For a super inexpensive alternative, use old magazines as inserts (that's what I use for my boots!). *Update: Jami of Imagine shared another super inexpensive alternative: old wine bottles!