CPC_Andrew - 9:27 pm on Oct 26, 2010 (gmt 0)
This link: [advertising.microsoft.com...]
is the correct link to sign up for Bing Shopping. They're still working out kinks in the new program, as you saw with the confirmation message.
Specifically, this link is where you would enter your merchant information to sign up.
Then Bing Shopping will contact you with an Onboarding Kit to get started.
Hope this helps.