Today my case has just approved from TSC.
EB1B Dec6, 2006
Fingerprint: Jan 10, 200
Ref: July 26, 2007 for correcting TB result.
Started on Sept, 2007, frequently calling USCIS, visiting inforpass since NC was not clear at that time.
witting letters to FL and all FBI high rank officers for NC issues.
Faxed twice to TSC for NC last months.
Applied for EAD on Dec.29,
Approved EAD on Feb. 4, 2007.( What a funny thing! just one day before the approval of I-485).
This is my personal experience to share with you guys. If you really want this thing done urgently like my case, you should keep bothering them by sending the letters.
Happy Chinese New Year & Good luck to everyone!