I was with my Wife in Colombia over the holidays and when I returned we had been approved by the California Service Center on 12/21. The letter states, "The above petition has been approved. We have sent the original visa petition to the Department of State National Visa Center (NVC) ....."

Do they send me a Case Number or a way to track the progress at this point?

you can call NVC and press the prompt tracking from ur uScis receipt no. and it the voice prompt will give all nessary information such as ur new NVC case no.
You may contact NVC at (603) 334-0700 from
7:45 a.m. to 6:45 p.m., Monday through Friday.
24/7 recording.

well congrates to find your nvc case number you can call nvc auto message line and use you uscis number to find out if they have recieved your app. the number is ( 603 )334-0700 and it will give you your nvc case number or it will say it hasnt recieved it yet the system is up dated early tuesday mornings good luck and congrats on the approval

get your self familiar with the nvc process and auto messages for nvc moves fairly fast
http://www.visajourney.com/forums/index.php?showtopic=91567

Thanks for the responses I will call first thing tomorrow. We were married in July and are anxious to be together. We are hoping we can get through the interview process in April or May and be together this summer here in the United States.

I hope everyone will have the same luck and that the system gets quicker for those of us wanting to be with our loved ones.

You should also get a bill soon for the I-864 Affidavit of support and your NVC case number will be on that. Be sure and put that number on the money order or bank check you send for payment.