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Do your pages reprint any materials from other sources?- No
Do you have strong backlinks, freely "editorially" given from other site just because they think their visitors would appreciate the content you offer?
Sgt_Kickaxe 'There are rumors of an incoming "dramatic" change in how Google evaluates links'. Anything in print on this or just hearsay or gut feel?
Some really dramatic changes to how we use links are on the way. (Sorry I can't say anything more specific. This is a really sensitive area.)
The central issue is that it's very difficult to make changes that sacrifice "on-topic-ness" for "good-ness" that don't make the results in general worse. You can expect some big changes here very shortly though.
badjocks: Whatever changed from 2/3 to 2/4 has wiped me out as well. Terms I have been ranking Top Ten for for years are gone. The main part of my site still shows up as do blog posts, but archives and specific topic pages all wiped out of the results.