I've recently discovered and begun using the SPServices jQuery library that is available on CodePlex. This is an amazing tool that can greatly simplify your client side work in SharePoint. From the CodePlex site:
"SPServices is a jQuery library which abstracts SharePoint's Web Services
and makes them easier to use. It also includes functions which use the
various Web Service operations to provide more useful (and cool)
capabilities. It works entirely client side and
requires no server install."
I'll have a post coming soon showing how I used this with the Taxonomy Web Service, solved some headaches on my end for sure.
In the meantime, go grab a copy and start playing around with it. And don't forget to donate, this is an awesome tool that deserves some of your cash!