Dave Ward at Encosia has made a great post on common ‘gotchas’ with jQuery and ajax/json:
(This includes calling webservices/pagemethods)
See also his post on jQuery + ajax on building a client side repeater:
I really like the use of jTemplate – as a fan of templates such as NVelocity, this is a powerful way to build UI without the heaviness of .net controls!
As always, Encosia has some great content available – thanks Dave!