Apple released Airport Client Update 2009-002 today fixing some minor issues in Snow Leopard’s wireless access software. A restart is required.
Update: Apple also released MacBook Pro EFI 1.8 firmware update for MacBook Pro 5,1 and 5,2. The update will require subsequent installation of Superdrive Update 3.0 which will quiet the DVD drive during startup and on wake from sleep. ***ALSO BEWARE OF THE LOUD BEEP DURING THE UPDATE***