I used to use YUI heavily, but not so much any more - I really rely on jQuery to get most of my work done. I still use YUI for the heavy lifting stuff, like creating dialogs, calendar widgets, that kind of thing.<p>But I found I was really over-relying on YUI stuff just because it was there. For example, we use YUI buttons throughout our app because I figured them out and thought they were cool and looked nice. Which is all true, but it adds extra overhead to pretty much any form we create now.<p>I try to keep to jQuery as much as possible and only delve into YUI when strictly necessary (though I really wish jQuery would bundle an onAvailable method into the core.)
Their rich text editor is finally usable. It stopped generating extra empty lines and producing crap on Safari. It also has gotten a lot faster, highly recommended. Load times are blazing fast: they serve it off their own CDN with very aggressive cache control and you can "bundle" multiple components into a single JS file using their "download builder".<p>Who else is using YUI? Their forums aren't very helpful, where do you guys hang out? Recently I had a couple of trivial questions and couldn't find answers online:<p>* How do destroy a control (RTE or anything else)<p>* How to put focus on RTE (not on startup, but later)
I like YUI a lot - especially the components they've written for it.<p>The YUI Rich Text Editor blows away everything else I've tried.<p>And on a current project, I'm using the YUI DataTable to get in browser sorting (and it does a lot more than that, too).<p>But for day-to-day stuff we use Prototype or jQuery because it's easier to write.