Django | The Web framework for perfectionists with deadlines: This framework has been around for a while, so maybe Rails is “Django for Ruby”?
Developed and used over the past two years by a fast-moving online-news operation, Django was designed from scratch to handle two challenges: the intensive deadlines of a newsroom and the stringent requirements of experienced Web developers. It has convenient niceties for developing content-management systems, but it’s an excellent tool for building any Web site.
The admin interfaces are gorgeously clean. See this page for some examples.
For a comparison of Django and Rails, you can't do better than Snakes and Rubies, a recent event here in Chicago. It featured presentations by Adrian Holovaty (Django co-creator) and David Hansson (Rails creator), then a Q&A session with both of them. While waiting for the audio and video to be posted there, the Django blog has a list of blog postings about it where most writers summed up what they saw as the difference.