The present bloggers have written some new papers and presentations on pi that are targeted to a wide audience. These files are freely available for download:

David H. Bailey, “A short history of pi formulas,” manuscript, Oct 2010, available at PDF. Jonathan Borwein, “The Life of Pi,” manuscript, Sep 2010, available at PDF. Jonathan Borwein, “The Life of Pi,” presentation, Sep 2010, PDF.