RoR obviously gained some massive popularity. However I don't understand why Django did not gain as much as RoR did. Python is a damn good language, which by the way is gaining some momentum due to google's big fat presence with the app engine.
So why is Ruby so popular? To be honest I am actually pretty unhappy with ruby (don't give me any more one-liner ruby scripts or I will bitch-smack yo ass) with how easy it is to make that language unreadable compared to say... python.
I work with a web server built in javascript and can tell you that with a loosely structured dynamic language it is horribly easy even for decent programmers to make unreadable code.