With Apple (AAPL) garnering only 3 percent of the U.S. personal computer market in 2005, it's not hard to see why the company's shares are surging 7 percent today. With news of a software program allowing users to run Windows XP on Macs released this morning, all of the sudden the company can go after much of that other 97 percent. Apple's design team certainly has a unique opportunity here. I don't see why they couldn't get 10% of the U.S. market within 5 years with the right new products.