Resources on using databases with Python
ChoosingDatabase -- lists databases supported by Python libraries.
DatabaseInterfaces -- another list of databases accessible from Python. (Should merge this list with the above one...)
HigherLevelDatabaseProgramming -- wrappers that provide simpler or higher-level database interfaces, such as object/relational mappers and SQL generators.
The DB-API
The DB-API is a specification for a common interface to relational databases, currently at version 2.0.
[http://www.python.org/dev/peps/pep-0249/ PEP 249: Python Database API Specification v2.0].
If you are looking for a DBAPI-2 HowTo, try [http://initd.org/pub/software/psycopg/dbapi20programming.pdf this one] (PDF).
Future development of the API:
DbApi3 -- discussion of possible topics for a DB-API 3.
Historical development:
[http://www.python.org/dev/peps/pep-0248/ PEP 248: Python Database API Specification v1.0].
Resources
DatabaseBooks -- lists a few recommended titles for learning about databases. These books aren't Python-specific.
[http://dmoz.org/Computers/Programming/Databases/ Programming:Databases] category on dmoz.org
Non-relational Databases
PersistenceTools -- describes non-relational tools for storing data on disk.