That_Guy - 2:12 pm on Nov 4, 2008 (gmt 0) p/g
Is it possible the code in the algo which rewards very strong home pages was accidentally deleted? Could that explain it? Or must it be something more complicated (e.g., conflicting parts of the algo).
The 302 hijack bug could explain some of the pushdown for home pages and search for company name, site name, etc. I haven't seen a full site-killer in a long time, but some individual pages and symptoms of larger problems have been showing occasionally. Google has been better at straightening things out, but not preventing them.