I wish more companies realized this.

EDIT: To add a little more to the discussion. Instead of looking for the 'rockstar' or 'ninja', look for intelligent and ambitious individuals that might not have all of the necessary experience. This gives them the chance to grow into the position, and results in a more fulfilling work experience. The end result is someone who is more appreciative of their employer, and who will probably stick around longer than the 'rockstar' who is probably getting calls and e-mails from recruiters every other day.