bumpski - 9:27 pm on May 2, 2011 (gmt 0)
that doesn't change the user experience at all.
Pageonresults suggests that "noindexing" intermediate navigation pages may improve the end user experience, making it more likely a user ends up on the page with the most relevant information to their search. Seems very helpful to the user/visitor to me.
What we do know:
Google continues to crawl "noindexed" pages.
Google follows links on "noindexed" pages (at least I know this).
I also believe Google does not penalize "noindexed" content in IFramed pages, (at least on the same domain!)
So I would assume as long as it's reasonable, in Google's opinion, that content is "noindexed" it might actually benefit the site's overall ranking (and the user experience as well).