Nice to see that there's a lot of activity going on related to PHPExcel! This weekend, I receievd my electronic copy of php|architect / November 2008 featuring an article on generating PDF and Excel files using PHP. Guess which library is being used in the second part of the article...
While reading the article, I noticed a very cool thing: the author, Aaron Wormus, is using a convenient way to generate charts in PHPExcel using Google Charts API. Since PHPExcel currently does not support creating graphs, this is really a good method to use charts in PHPExcel generated Excel files. Here's a screenshot of the generated file in the magazine: