Timeline:

May 18, 2011: I29-F packet sent.

May 20, 2011: I29-F received by USCIS.

May 27, 2011: Received I-797C, NOA1 (Notice of Action 1). Processing at Vermont Service Center with a Notice Date of May 25, 2011.

(If you are anywhere in the visa process or are just looking for more information, I suggest you check out www.visajourney.com. I have found this website to be invaluable. It has everything from example forms to estimated processing times. There are also great forums where you can find answers to any possible questions you could have. You can find me and my timeline here.)