Python and Django

Python and Django, a similar combination to Ruby on Rails, is another scripting combination for the web for speedier delivery schedules. Adrian's Django presentation gives more information on the history and the present trends with Django. There has been a lot of hype surrounding Ruby on Rails. But that will involve learning a whole new language, Ruby. When it comes to Python, you can safely bet on Django. Generating PDF's were my biggest concern in my previous project. I was overwhelmed to see that there is ample support for outputting PDF's. Here's the documentation for this! :)

Google App Engine

Home page for Google App Engine

Developing and deploying an application on Google App Engine
youtube demo link

Google App a second look
on High Scalability blog

Also check out Heroku for RoR deployment something similar to Google App Engine for RoR.