A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Another way you can do that is simply clicking on the chart(s) and selecting print from the office button. When the print dialog comes up, change the printer to Adobe PDF and in "Print what" select "selected chart" (for excel 2007, that's the default). This will save your charts in PDF. You can only print/save one chart at a time.