pageoneresults - 8:33 pm on May 27, 2008 (gmt 0)

The new version of the site will include several new sections. I might consider using noindex in META for parts of these and slowly remove the noindex tags every X days/weeks.

What you may want to consider is noindexing the middle parts of the click path. That is usually where the PR waste factor occurs. Its also all relative to how the taxonomy of the site is set up too. In your case though, PR6 represents health to me. Actually, anything with visible PR these days represents health. The page has been indexed, it has been calculated and it has passed all the "normal" routines to "join the club".

The site is PR6 currently with around 500,000 backlinks to multiple pages within it as Yahoo! Siteexplorer reports.

Ah, a larger site. A half million backlinks is nothing to sneeze at. And, that's a lot of power to have at your disposal. Think of yourself as the Conductor of a fine tuned symphony. Take that incoming "juice" and "direct" it to where it needs to be. Skip all the bouncing and drilldown routines and just put it directly at the target. Am I making sense?

In order to increase PR I can think of 301ing a few domains to new sections' home pages in order to provide some juice flow. Is that a good idea?

Yikes! Karma. You've got a PR6 with half a million backlinks, don't even think about it. ;)