OMZen - 9:40 am on Dec 5, 2010 (gmt 0)
Sorry Tedster - I don't exactly agree that for mega sites, structure is the king.
We did a text book restructuring and turned a search engines hostile mega site with couple of million pages ( dynamic url's, keyword cannibalization, dup content, etc) into SE friendly site with flat IA, good interlinking, unique content, etc )
Google came, saw, recrawled, indexed everything fine - then it started dropping pages.
Bottomline: LOADS OF LINK EQUITY is the REAL Queen for mega sites! One can have a perfectly structured megasite, but it will implode if not backed by massive link building campaign.