Aaranged - 6:43 pm on Jun 6, 2011 (gmt 0)
onebuyone / Propools - I don't know that "rich searching" has much bearing on the use of structured data. Whether or not Google users avail themselves of the sort of filtering and "rich searching" now available with Recipe View, the far more important uses that Google (and the other search engines) have made of structured data is in the generation of rich snippets and search verticals.
tedster - Thanks for quoting ManuS#*$!y's "false choice" post: I think everyone concerned with the nitty gritty of this issue so read it carefully, as well as a contrary view [mkbergman.com] from semantic web researcher Mike Bergman.
As I've pointed out in my response to ManuS#*$!y [manu.s] and my own piece [seoskeptic.com], I don't think the success of failure of schema.org will revolve around whether or not the schema.org microformat vocabulary is the best way to deploy attribute-based structured data (it isn't) but whether or not it will be adopted on a wide scale anytime soon. I agree with the schema.org documentation that microdata is easier to deploy than RDFa, so I think the chances of success are fairly good.
(For those wondering ManuS#*$!y doesn't result from tedster and I skipping over the space key, but because his last name triggers MWM's spam detection.:)