stalk said:5/30/06: N400 Mailed to CSC
6/2/06: N400 Recd by CSC
6/10/06: FP Notice Date
6/22/06: FP Taken
9/21/06: Status can't be found in USCIS (finally some change)!
?/??/06: Recd Int Notice
?/??/06: Interview
Same situation for my case as well, couldn't find my case status on the web any more. For whatever it worth.
My N-400 timeline:
05/29/06: mailed to CSC
06/08/06: N-400 PD
07/06/06: FP Appointment
09/21/06: Case online status disappears.