I recently updated this popular PowerPoint add-in (17,568 downloads in the last 12 months) to support PowerPoint 2010 including the 64 bit version. For more see the updated blog post.
Archive of posts filed under the add-in category.
TM AutoChart
This Excel add-in links the minimum, maximum, major, and minor values of a chart axis to worksheet cells.
For more see http://www.tushar-mehta.com/excel/software/autochart/index.html