Tired of ASP.NET, which of the following should I learn and why?
I would probably learn Ruby on Rails.  It has a lot of different methodologies compared to ASP.NET, and it might open your eyes to some different and very powerful approaches to web apps.
Which of the following technology is easy to learn and fun for developing a website? If you could only pick one which would it be and why

Clojure/Compojure+Ring/Moustache+Ring
Groovy/Grails 
Python/Django 
Ruby/Rails
Turbogear
Cappuccino or Sproutcore
Javascript/jQuery