Florent's DeadlockDebugger in turn builds on an external C threadframe module:
http://www.majid.info/mylos/stories/2004/06/10/threadframe.html
Folding the functionality of that (or similar functionality) into the core would, IMO, be a valuable addition for 2.5, and would make an excellent intro project for an aspiring contributor interested in how threads work in CPython (what this module does is conceptually simple). It belongs in the core because it's not safe to chase the tstate chain without holding pystate.c's internal head_mutex lock (holding the GIL isn't enough -- it's normal practice to call PyThreadState_Delete() while not holding the GIL).
I'd do it myself (and maybe I will anyway), but this really would make a good (finite; conceptually simple) project for someone who wants to gain Python developer experience.
What would you suggest calling it? sys._current_frames(), returning a dictionary?
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