Her changes were:

• new urls
• removal of tag cloud
• increase page load
• search results pages - excluded with robots.txt
• "heavy use of noindex and nofollow"
• noindexed all forums pages with no replies
• social share buttons bigger
• removed dup content

Of course, who knows if those changes actually made any difference.

Ok, I have now written my own little page on Panda. It is a bit vague though! 

Google Panda – Site Quality Guidelines – What do they Mean?

Ooh, that came out larger than expected.