korkus2000 - 9:39 pm on Jan 16, 2009 (gmt 0)
YUI is good, but I have found most of the developers I talk to use jquery. The jquery library is very well documented, as is YUI. I found jquery to feel very complete and packaged while YUI was a little more modular. I think both are great, but I just have seen a trend towards jquery for designers and front-end people.