Just this morning, I discovered a good short series on writing PL/pgSQL functions. These guides are written as part of the Postgres Online Journal, by Regina Obe and Leo Hsu. Aside from this short series (from back in 2008, but still very relevant), there is a lot of interesting stuff there.
The Quick Guide to Writing PL/pgSQL.
Part-1
Part-2
Part-3
They also produce a nice Cheat-sheet for PL/pgSQL.
Cheat-Sheet
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