I was pulling out my hair (figure of speech as I don't have any, ha!) trying to find information around this, and, as is the case pretty much all the time, the second I post a question to the SharePoint forums, I find it on my own.  So lesson learned: whenever you want to find something, ask the question to the masses, then you'll find it right after you ask the question.  Now, onto the "meat" of this post.

When SharePoint 2007 came out, there were a lot of folks that were using the Office Web Components in their SharePoint 2003 implementations, and they wanted to use them in '07.  There've been many an article written on how to do the installation in '07 (like this one here) that walked you through the steps necessary (as it's not just "install-and-go") and I was looking for information that stated whether this was supported or not for SharePoint 2010.

Lo-and-behold, buried in the Changes from Office SharePoint Server 2007 to SharePoint Server 2010 TechNet article, in the Features removed from SharePoint Server 2010 section, it's explicitly called out.  The excerpt related to OWC is below:

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Office Web Components
Description: SharePoint Server 2010 no longer supports Office Web Components (OWC). The PivotChart, PivotTable, and Trend Chart report types are no longer available as options in the SharePoint Dashboard Designer.
Reason for change: This is a 2007 Microsoft Office system feature that is now replaced by the features available in Excel Services in Microsoft SharePoint Server 2010 in SharePoint Server 2010.
Migration path: In SharePoint Server 2010, use Excel Services instead of Office Web Components.
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So, per the Microsoft documentation above, these components are *not* supported for SharePoint 2010 implementations.

Now, as these have been considered deprecated for a while, you've already started moving off these and onto Excel Services, right...?

- M