Yesterday, FASB issued some long-awaited stock option expensing rules. The news release is here and the full text of FASB Statement 123 (revised 2004) Share-Based Payment is here [pdf]. The press release states that approximately 750 public companies in the U.S. are already “voluntarily applying Statement 123?s fair-value-based method of accounting for share-based payments or have announced plans to do so.”
PlanSponsor.com has a good article here.