PowerPivot and DAX papers,posts,FAQs,webcasts,samples

I was recently working with a customer to help them solve an interesting PowerPivot problem where they had wanted to get the Top 10 users within their data set and create reports based on that.  One approach is to create a rank function within PowerPivot as noted in a Rank function thread on the SQL Server 2008 R2 PowerPivot for Excel forum?  Another way is to create a Pivot Table where the UserID was placed in the [rows] and the measure in question in the [data] area; and sort the data from largest to smallest.