Gemini renamed

Microsoft has renamed Project Gemini as Power Pivot.

Project Gemini

Impressive Excel addin for BI analysis  from Microsoft.

As far as browsing a dimension using ADOMD.Net is concerned, some of the performance issues can be addressed by converting the dimension to XML, although this, obviously, will be an offline process.  At runtime, each node click in the browser treeview can be an async server call to return the hierarchy children via a XPath query. Also, a search feature can easily be added by converting the dimension to a flat table as part of the offline process so that a XPath search returns all matches as a flat list.