We applied for CPV (143) in April 2009, received acknowledgement on 14th April 2009 and on 6th August this year got our Case Officer assigned. It's all go from here on - they gave us 28 days in which to have our police checks, medicals and to arrange my daughter to go to Centrelink to sort out the Assurance of Support. This has only taken 15 months and is a couple of months earlier than we expected.
After this, we hope(!) to be paying our AoS in Sept/Oct, then the huge visa fee on Oct/Nov - we should get our visa in December. From the date of our medical (11th August), we expect to have to validate our visa by going to Australia by 10th August 2011. We're so excited, but there's loads of forms to fill in and we'd like to sell the house before we go. If we don't, we may have to 'hokiday' in Oz to get our visa validated, then come back to sell our home. Keep your chin up! Once you get your Case Officer, it's a mad rush!
Good luck - remember, patience is a virtue!!