This excerpt taken from the XIDE DEF 14A filed Jul 16, 2007.
Restricted Stock Units
In December 2006, the Companys Board approved amendments to the 2004 Plan, permitting it to award restricted stock units (RSUs). The RSUs allow participants to defer the recognition of ordinary income associated with long-term equity incentive awards until all RSUs have fully vested. For fiscal 2008, the Committee awarded RSUs to plan participants. The awards vest ratably over a five-year period, but shares of
common stock will not be delivered to the employees until the end of the full vesting period. If the recipients employment with the Company terminates prior to the end of the five-year period, the employee will receive stock certificates for any vested RSUs.