I know I'm not answering your question, but I have to jump on my soapbox for a second.......
File a NASA form IMMEDIATELY! If whatever you did was inadvertant and happened less than 10 days ago, the NASA form will go a long way to helping you out.
First of all, it keeps you from having to suffer the punishment. For example, if the FAA decides to suspend your license for, say, 30 days and you have filed the ASRS form, you will not have to serve the suspension. It will be on your record for 5 years, but you won't lose your privledges for any period of time.
Second of all, FAA inspectors take your attitude into account when processing enforcement actions. Filing a NASA form is considered evidence of a "constructive attitude". In my one experience with the FAA the fact that I could prove that I filed a NASA form kept the inspector from issuing me a Letter of Warning. Instead, we had an informal UNRECORDED counseling session. FAA inspectors aren't evil people. Give them a reason to go easy on you and a lot of them will.
Finally, if you do send in a NASA form, send it Registered Mail, Certified Return Receipt. That way, if the identity strip doesn't make it back to you for some reason, you still have proof you sent it.
If, for whatever reason, a NASA form won't help you out, it's not the end of the world. We're all human. There's an infinite number of mistakes waiting to me made out there, and if it can be done one of us is going to do it sooner or later. If you end up with a violation, be prepared to explain it, but be prepared to explain it as a learning experience that has made you a better and a more safety concious pilot (It has, hasn't it?).