The Internet auction site eBay, a favorite on-line haunt of memorabilia collectors and bargain hunters alike, is also a popular destination for United Space Alliance officials responsible for tracking down hard-to-find parts needed to keep the space shuttle in business. Designed and built in the 1970s, the U.S. space shuttle fleet relies on a host of diagnostic and ground support equip-ment powered by computer components that are no longer manufactured. NASA plans to spend about $1.5 billion over the next five years upgrading its space shuttle fleet for improved safety and operations. While most of that money is targeted toward...