Check out VMware Workstation 6's record/replay feature

Posted May 15, 2007 23:06 UTC (Tue) by rrdharan (subscriber, #41452)
Parent article: Improved Linux debugging with Chronicle

See description/instructions here:
http://stackframe.blogspot.com/

And a higher-level description here:
http://blogs.vmware.com/sherrod/2007/04/the_amazing_vm_.html

You can take a recording of what's happening in the virtual machine, then replay that recording as many times as you want, with gdb attached, and set breakpoints, examine state etc. as you wish.

In my very biased opinion, it's a very attractive approach to the debugging and instrumentation game.