With some tweaking the script that Alan Proposed did work in my situation. 
(50+ tables and a lot of references)
https://groups.google.com/d/msg/web2py-developers/QxeJNByj6qc/cpBHsa1ymUkJ

In Short:
1) recreate the complete model in postgres: db_new = 
DAL('postgres://user:pass@localhost/projectname', migrate=settings.migrate, 
check_reserved=False, entity_quoting=True, bigint_id=True)
(Still have to find a smart way to get the auth and other tables in there; 
for now I did it manually)

Let web2py create the empty tables for the db_new postgres table.

2) Place the sqlite2pg.py in modules/
(One small modification: I had to remove the line which truncates the table)

3) Write a controller:
def migrate():
    import sqlite2pg
    sqlite2pg.migrate(db, db_new)

4) swap db_new and db in you DAL connection file.

Hurray: Working postgres DB with all data. :)

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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