Yes, we are. This is what gave me the insight I mention above. Our significant words were "women" and "clothing" (we're a women's clothing shopping site) now they say "media wiki" is our most significant...!

Its what leads me to believe Google has almost chalked us down for the wrong set of terms, given that it must have thought Mediawiki was almost a big part of our site.

Theres that and the Mediawiki duplicate pages, too which doesn't help our cause...