Does anyone know if there's a site that tracks the popularity of the big/various JavaScript libraries?
Here's an unscientific but nonetheless interesting comparison. It's interesting because it showed Dojo peaked and jQuery is really ascendant, suggesting jQuery has eaten Dojo's market share.
I think now that jQuery is shipping with Visual Studio you're going to see a huge jump in it's popularity.
Click on the "tags" link at the top of the page.
- JQuery: 1970
- Prototype: 135
- Dojo: 71
- Mootools: 39
Those numbers line up with my intuition on the subject; JQuery is dominating.
The idea of using Google Trends comes from a comment by none other than John Resig on Simon Willinson's blog post on this topic back in 2007. I tend to agree with him: Google Trends for the leading libraries is a good heuristic. John's original search omitted Ext (and the acronym "yui" for Yahoo UI); my version is merely an update.