And if the question mark remains on the "www.google.com" certificate in the Blackberry store (when viewed on the Blackberry via Options/ Security Options / Advanced Security Options / Certificates, then...
1. Press the Menu key while on the "www.google.com" certificate with the question mark
2. Select the Details item on the Menu
3. Select the "Fetch Status" button.
... at this point, I don't remember what's next.... but I think it's a button to explicity trust the certificate.
PS: for those that don't have the Google
certificate showing up in their Key Store, the Crackberry.com discussion cited above has some recent posts on enabling certificate syncing via Desktop Manager that pulls in this certificate.