The principal cast of Grey's Anatomy just received pay increases for the upcoming season 3. The recipient characters are as follows:
Meredith, Derek, Preston, Bailey, Chief Webber, George, Alex, Christina, AND Addison and Izzie.
This should allow us to rest easy that both Addison and Izzie will remain on the show for at least part of season 3. Hooray!
Source: E! Online