I'd also love to see a JQuery screencast on Peepcode that goes deep
into the internals, and strategies of using jquery for unobtrusive
javascript. However, I think its probably worth mentioning the wealth
of screencasts already for jquery (check youtube) so this need may
already be filled.
The suggestion box entry for it has been tagged as "started" so it
sounds like he's working on it:
http://suggestions.peepcode.com/pages/15-general/suggestions/778-jquery-screencast
Focusing on specific plugins may not be the right approach, since they
tend to be fickle, with new, better plugins coming out every few
weeks. Putting a quick section on how to create a plugin would be
great though, since the basics are so simple and straightforward, but
easy to do wrong so that it works but not js library agnostic.
I'd suggest going heavily into the methods LiveQuery / live / die, and
also on using bind() in order to attach custom methods to dom
elements, and using trigger as the message passing technique.
Basically all the good stuff in jquery that all the existing beginner
"jquery for designers" screencasts overlook.
Thanks