I have to agree with you on JQuery. It runs on multiple browsers too and performs exceptionally well. It's gotta be one of my all time favorite pieces of software.
It's hard to overstate how great jQuery is. I'm always surprised at how easy it makes things. I remember the bad old days, spending hours researching the different ways to reference dom objects, trying to find a method that worked in more than one browser. With jQuery, you really can just code it once, and it works everywhere.
