Overview of competing Python modules?

[Thorsten Kampe]

Has anyone ever compiled an overview of competing Python modules?
Something like "there's the standard cvs module and the one from
pycvs.sourceforge.net but most people use cvs (or pycvs) because it's
<whatever>".

I'm particularly interested in competing modules for:

* CVS formatted files

* XML formatted files

* Database connectors to
    MySQL, PostgreSQL, Sybase, MSSQL and ODBC

    
Thanks, Thorsten