Ruby on Rails.

Tons of hype surrounding this new development platform. After working with the last couple nights, I have to say it's pretty sweet. The platform takes care of a lot of work and configuration for you. It creates the directory structure/framework for you.

Suppose, you want to connect it to a DB, all you have to do is tell it where the DB is localed (localhost, etc) and the username and password. Done. It figures out which DB you want based on the name and the name of the controllers and etc you created. It even knows the difference between plurals. Name the DB 'rabbits', name the project 'rabbit', it knows that they are one in the same and syncs them.

The system as a whole has few lines of code. I only had to write a few to create some decent features. Pretty interesting stuff.

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Video
Starting Guide