Yesterday the official name for Project Gemini was announced during the keynote of the SharePoint Conference, as of now Project Gemini will be known as PowerPivot (for Excel).
Personally I feel this name is very well chosen since it really expresses what Gemini is about, in the end it is a PivotTable (or Chart) on steroids.  Of course there is a lot more happening behind the scenes but that is exactly what you should not be worrying about, the 'tricks' behind the scenes are not what Gemini is about, it is about giving flexibility to the end user to get to information and improve his insight.  But before all the end users in the world start cheering and partying, remember that IT still has control over the sources and even more insight in what you are doing than before ;-) 

And of course, with a new name comes a new website: http://www.powerpivot.com.
I hope you are all looking forward to the next public CTP of SQL Server 2008 R2 including the new PowerPivot add-in.

The hardest part for me is always to stop using the name Gemini, we have been talking about Gemini for over a year internally which makes it kind of a habit :-)