Our index went to a PR 2 yesterday and all our interior pages went to a PR 0. Facts 6 year old site Has been a PR 5 forever Many interior PR 5 and PR 4 pages A huge amount of #1 rankings (still there thankfully) Subdomains kept their PR 4 Over 1100 pages indexed Daily New Content Over 6000 uniques per day No noticable drop off in traffic