Now IE9 hangs, now it doesn't.

IE9 fires up, I open a couple of pages in separate tabs (BBC News or something), then after a minute or two it hangs (as if it's "Not Responding", but it's not labelled as such in the Task Manager).

To compound the misery, it freezes the mouse-pointer when it hangs.  (It's okay:  I like my keyboard navigation anyway - and that still works for kicking round Windows and other apps.) Kill the iexplore.exe processes to get back to normal operation...

Anyway, looks like the solution is to hit the "Advanced" tab on your Internet Options (before the browser hangs, naturally!) and "Use Software Rendering instead of GPU Rendering".
Restart IE, and no more crashes for me!

Windows 7 64-bit, 32-bit IE9, Lenovo Thinkpad T500.