Thanks for the reply, that's good to hear.
The The Protocols and Formats Working Group published the WAI-ARIA 1.0 framework as a W3C Candidate Recommendation on 18 January 2011. As per a news updated from August 2011. they are currently gathering WAI-ARIA implementations (http://www.w3.org/WAI/aria/faq#update
). Whilst W3C Candidate Recommendations are subject to change I think it's likely that most of the properties and attributes will remain unchanged.
There's a useful (if slightly lengthy) Primer for WAI-ARIA here:http://www.w3.org/TR/wai-aria-primer/
From a validation perspective I think the most useful reference is probably the W3C's "Supported States and Properties" page, which details the attributes and properties: http://www.w3.org/TR/wai-aria/states_and_properties