If you can't afford to replace your windows with the latest energy-efficient, airtight model, pick up an inexpensive Shrink and Seal window insulator kit at any home improvement store. The basic idea is to shrink-wrap your windows to block cold drafts without obstructing the view. You only need a pair of scissors, a hair dryer, and the kit's double-sided tape and plastic film. You outline the windows with tape, lay out the plastic along the tape somewhat tautly, and then blow dry the film until it stretches taught and translucent. Warmer home, more efficient heating system, and uncompromised aesthetics.