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I recommend putting it in the tutorial.  As it stands now, the 
glossary can be profitability read A to Z after completing the 
tutorial.  It can serve to unify and solidify the ideas 
presented up to that point.

The reference manual is more encyclopedic and I think the 
glossary would be lost in a sea of entries.

Another alternative is to make it a stand-alone link from the 
main page:
     Tutorial (start here)        Ref Manual
     Lib Ref                           Glossary of Key Concepts

This patch is marked for Py2.4.  I recommend that it be 
added to Py2.3.1 also.