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How to Pop your GA Data into R
This looks post by +Matt Clarke looks particularly handy. I'll be having a crack at it at work when my time frees up a little more.
A beginner's guide to getting started with the R Statistical Computing programming language for Google Analytics data analysis.
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Thanks, Rob. I need to find the time to sit down with R and read a book to figure out how I can use it.

One thing that does look good is its aggregate function, which would allow you to pull in data from multiple GA profiles/sites into a single report, which would make roll-up reporting very simple.
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