Found out something new today...I'm continuing to develop my Python web application server project, which *should* run on both IIS/ASP and Apache2/mod_python.
I have a few pages in development, and the Invoice page was loading quite slowly. So, while waiting the 30 seconds for it to load (don't ask--it's fixed), I happened to fire up the Admin page I had written. That is, I tried to. It wouldn't complete until the Invoice page had finished!
After much hack-and-slash debugging, turns out it was dependent on my referencing the ASP Session object in both ASP scripts (passing it to Python classes). Once I passed None instead of Session, no more problem.
Frickin' brain-dead threading models. One request per session??!?!?!