As you may already know, the new name for Project Gemini is PowerPivot and the official names are PowerPivot for Excel and PowerPivot for SharePoint. For information and to sign up for notification on the release dates, check out the official PowerPivot web site at http://www.powerpivot.com/
Shortly after the SharePoint conference, our Analysis Services teammates independently created their own very interesting blogs:
In addition, some solid new content / aggregator blogs include:
Enjoy!