Travel has decreased since 9/11. So how are people using the funds saved by taking fewer vacations? This story in the St. Louis Post-Dispatch suggests that people are pouring money into the ground. An in-ground pool, that is. "National figures show the number of backyard pools has increased by about 20 percent in the past five years." Pools aren't cheap though. The article reports costs of $40,000 and higher. Pools are estimated to increase the value of a home by 8 to 15%, so for higher-priced homes they may be a sensible investment for people who like to swim.