I'm not sure that GAE is the ideal environment to run Django in - the whole reason it scales is because it enforces a certain way of doing things (nonrelational datastore, no long-running processes, no local storage).<p>General Django PaaS will probably be 'nicer' with the various less-restricted options that are springing up (be that mine, ep.io, or others, like djangy, gondor.io, apphosted, or the several others I forget), since those tend to lessen up on the "it must scale" aspect and focus more on making the 99% majority of sites (i.e. medium sized or smaller) work well.
I am currently using Django Nonrel with mongodb with very good success for some client work. It's actually deployed to AWS not App Engine, but the code between the two is virtually identical. AWS was chosen for video processing requiremets. The tools and short cuts django provides like the automatically generated admin have made the project viable. I haven't seen the db-indexer project before, but looking forward to checking it out.
Minor thing, could we have the link go to <a href="http://code.google.com/intl/nl/appengine/articles/django-nonrel.html" rel="nofollow">http://code.google.com/intl/nl/appengine/articles/django-non...</a> instead of <a href="http://code.google.com/intl/nl/appengine/articles/django-nonrel.html#fw" rel="nofollow">http://code.google.com/intl/nl/appengine/articles/django-non...</a> ?