Is there any database abstraction layer (DAL) or relational object mapping (ORM) that runs on the Google App Engine (GAE) and regular relational databases (RDBS) other than web2py 's?
If not, is anyone working on migrating one of the existing DAL / ORMs to GAE?
There is an ORM for the Google App Engine. There are some differences between it and SQLAlchemy, but it looks like it works. Check out this page: http://code.google.com/appengine/docs/python/datastore/entitiesandmodels.html
Web2Py DAL, GAE. , GAE: http://mdp.cti.depaul.edu/examples/default/index
Currently, SQLAlchemy seems to be working on this, but it is incomplete / incomplete. Good luck