Rails envy videos on Ruby on Rails
Greg and Jason at railsenvy.com has been running a series of videos comparing Ruby on Rails with other similar technologies. Here is a collection of them. Some of them are pretty good.
Ruby on Rails and Java
Ruby on Rails and PHP
Ruby on Rails and PHP - 2
Ruby on Rails and PHP - 3
Ruby on Rails and .NET
Ruby on Rails and PHP - 4
Ruby on Rails and Django