Tired of ASP.NET, which of the following should I learn and why?
OK, first, apparently we all need a pants check. Done?
I'm of two minds:

if you are looking for a practical language / platform to pick up that you hope to use to help you in your day-to-day then I'd go with Python/Django. Python has developed into a really sweat and powerful language and Django is as nice a web development MVC as any other and pretty easy to pick up and get going with. You can run it locally, its easy to deploy on Apache w/ mod_python. Did I mention that Python is a really nice language? Also good support in the tools world, google app engine etc....
if you are looking to expand your thinking/though processes about the way you program and think about programming then I'm with Joel Spolsky - choose HAppS (Joel would go Haslkell) or Clojure which I've not used but I've done a lot of lisp and it makes you think different and the language constructs like the macro capability will change the way you think of solving problems
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