Dan01 - 1:58 am on Sep 2, 2011 (gmt 0)
Do you think it would be a problem to put 8,000 or 10,000 lines of code in the Robots.txt file? It would be a challenge to put the tag in each of the pages.
Also, Google says that if the noindex is used it will not show up in the search results. I have not read yet that they will not hold that page against you with Panda.
About a year ago I used noindex for a folder in one of my websites. A couple months later I noticed Google quit indexing the whole site. I am not sure what happened, but it worked out OK in that instance because I later I didn't want that site index. In this case, I want everything indexed.