I read about some reports on third-party driver-compatibility problems after the update. However, my orangeware driver still works fine with the Dlink DWL G650. Consult orangeware and see, if they have an idea other than waiting for the next tiger update.
And welcome to the forum.
As Zammy-Sam stated, several people have complained since Tiger. Search the forum here and see if any solution was found. Moreover, you can search Apple's support page as well, besides orangeware and related sites.