It loooks like Google AdManager is finally being released! I have just received an e-mail saying that Google Admanager is available to me if I sign up for Google Adsense, and if I already have Adsense it gives me an invite request e-mail from google itself! This seams really similar to the GMail release, so If i end up getting some invites to hand out I will post! Personally though I am really looking forward to admanager, it seems like a fantastic solution and it should handle all my ad sales impeccably!
I've had an invite also - and from what I can make out it is an option when creating a new AdSense account (I've not done this, Google's email just implies this).
Yep, it says the option will be there. It's a shame they haven't made it easier for existing adsense customers, but I will be having a gander in adsense to see if there are any new options at lunch time!
I can imagine it being easier than manually updating 40 websites with links and sales, cancelling creating etc, with only a spreadsheet to guide me.