After six months pending with the 1447b case, eventually I got my case approved and oath scheduled. I would like to thank this incrediable forum and all the valuable members who contribute a lot.
I filed in early September 06 and already had three extensions. Before that, I felt so desperate until last Friday, I received an email from the AUSA and a phone call from USCIS today, informing me the good news.
For those who filed and expedite request sent before 12/21, don't worry. I think FBI is working on the backlog of the expedite cases and since there're no more automatic expedites, your name check will be completed soon.
For those who filed later than 12/21. You'll have to fight and eventually the victory will be yours.
Good luck everybody!