The following documents referenced are not written by python-ldap project members. Therefore some information might be outdated or links might be broken.
Python LDAP Applications articles by Matt Butcher
This also covers SASL.
Gee, someone waded through the badly documented mysteries of module :mod:`ldap.schema`.
Another article for getting started with python-ldap.
The LDAP Application Program Interface, mainly for LDAPv2.
The Internet draft of the discontinued IETF working group LDAPEXT is of interest here since the OpenLDAP 2 libs implement this (expired) draft.
VSLDAP Interoperability Test Suite.