Hi Spiderman - It looks like we are on the same boat. It's been more than 3 months since I sent my application and my case is stuck with the yellow letter. I called the 800 number several times and always get the same answer, that I have to wait. Only once I was able to talk to a 2nd level officer. Today, I went to my infopass appointment and was told that my case is in Lees Summit, it was very hard to listen to what this guy was saying through that thick glass and people talking to another officer right next to me. I think he said that the case in a "fileroom" and that "they" might be ready to send it to my local office which is Chicago. I got home after this appointment and called the 800 number again, this time a woman tells me that they are waiting to get some feedback from the FBI, which I don't think it's true because when I called a couple of weeks ago, I was told that they have received my fingerprints and everything was fine, but just to double check, I called the FBI today, and they assured me that the FP results were sent on the same day. I don't know what is going on with my case... It is very very very frustrating!!
Here is my time line
PD 8/13/2009
FP 9/09/2009 Done
Yellow checklist 10/13/2009