Indexing and performance

Folks,

Can anyone direct me to a source of indexing and performance advice for
PostgreSQL?  What I'm interested in is questions like:

Q. I have a number of reference tables which serve as pointers to other
tables for user-defined searches.  As these tables see constant
additions (20,000 + records per day, deleted every night) but link with
the keys in other tables, I'm not sure of the indexing strategy I should
take.  The additive nature of the tables would argue for light indexing;
the fact that these tables are used linked in large views to produce
on-screen reports would argue for heavy indexing.  Suggestions?

-Josh Berkus


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