I read through Inside Idaho's "Standards" page (concerning the data they offer) and decided it was time for an update. In the process, I tracked down, updated and read through a lot of the supporting references. My GIS Standards page is not the last word, but it's some newer ones (or was, in 2006).
Three relevant artifacts applying the Google Maps application programming interface (API):
Beyond Google's own documentation, the Blackpool Community Church Javscript team tutorial from Mike Williams seems to be the best resource going.
The Map Room is a good weblog about maps.
The Natural Resources Conservation Service (NRCS) has an updated set of maps for the state, with various themes.
The data of interest don't have to be in XML format, nor do they need to be manipulated with XSLT (eXtensible Stylesheet Language Transformations), but the full-blown Ajax concept encompasses that.