The new page http://giftedandtalented.com/ is not up yet ("coming soon").

However if you try to log into an SSA account at http://epgyschools.stanford.edu/doe/
it says
"Record Not Found
We could not find a record for you. Please use the back button and try entering your information again."
Trying again doesn't help. It looks like the SSA accounts have been disabled. This means that I lose the ability to customize my kids' courses, which is a big problem for me.