I can has JavaScript Effects!

Despite its glaring lack of certain very obvious features (like a useful element wrapper), I'm starting to really enjoy working with Yahoo UI. What you don't get is annoying, but a lot of aspects of it are really feature complete. I got a really complex drag & drop API working in just a couple of days. I got some nice (very custom) modal elements working in an easy-to-customize manner yesterday and today.

I'm not about to become a YUI apostle, but I definitely don't hate working with it anymore, either.

It's nice to be able to feel like I'm accomplishing something and feel proud of it, too. :)