I’m still unhappy how I lost the jQuery battle at work. Although I’m not banned from using it but hey this is encouraging! jQuery may just win the javascript framework battle at least in the popularity category.
Other frameworks are just not as user friendly IMO.
Pure-Essence.Net 
I’m curious as to how you feel the other libraries aren’t friendly.
I tried mootools first because they had a cooler demo list back then, but it really wasn’t as great as I thought. So then I switched over to jQuery and it was so easy and fun to work with. I love it! Yay we have something in common. :left:
Prototype is very nice. jQuery most closely matches the spirit of JavaScript though. Fun, if slightly insane.