Just a note from the folks at PowerPivotPro. PowerPivot “Owns” Excel Now! Specifically, the top 2 Excel books on Amazon are PowerPivot books.
Speaking of PowerPivot, I spent some time with Pivot Stream on Friday. They have options to move PowerPivot spreadsheets to the cloud including auto refresh via VPN.
I’ve had a number of folks ask about options to share and auto refresh PowerPivot based sheets without having to spend the dough for SharePoint Enterprise and this looks a great option.