The Office 2007 cumulative updates (CU) for April 2010 were released recently and contain the latest fix for the chart crashing. It's only targeted towards one issue but contains the previous hotfixes as well (hence the term cumulative updates).
This knowledge base article has the description of the hotfix
There's two known tricks can try if you are still seeing the problem:
1. Try setting the processor affinity to use one CPU
Launch PowerPoint 2007. Open Task Manager, right click POWERPNT.EXE under Processes Tab, click Set Affinity and turn off all CPUs except CPU0 and then check the behavior.
2. Insert the slide deck into a new file using Reuse Slides command
Close all PowerPoint files. Create a new file, delete the first slide so there are no slides, then go to Home tab, in the Slides group, click New Slide drop down, click Reuse Slides..., click Browse..., Browse File... select the file you were using when the problem occurred and Open. Right-click on one of the slides on the right and click Insert All Slides... (this inserts your file into a new file, this sometimes helps with file corruption or formatting issues)
If this doesn't fix the problem please post a comment with the PowerPoint version, build #, and most importantly the exact steps you take to get to the problem (PowerPoint Not Responding) (hang). Please attempt to recreate the problem on a new blank file without any template applied (or default template). If this issue is important, urgent, critical, etc... and you demand a fix please contact customer service to open a support incident at 800-MICROSOFT or online at http://support.microsoft.com/oas.