1script - 3:26 pm on Apr 30, 2013 (gmt 0)
@purplekitty: it's uncanny, I also have one and only one KW that has never been touched by any of the issues the site as a whole has been through since 2011 (not only Penguin). By now it has become so prominent that it's hard not to notice it, it's been ontop of my KW lists for several years now, even before the troubles started.
The page that comes up on that KW is nothing special. There are no external links to it that I can find. Internally it's not linked any better or different than other 300,000+ pages of this site (large forum). In fact, there are plenty of other, better linked pages, internally and externally. The most dis-concerning to me is that its topic is not even exactly ON TOPIC with the rest of the site. As far as my own site is concerned, the page is absolutely unremarkable in every way.
In SERPs for that KW (two KWs actually - singular and plural form) this page is holding its own against such behemoths like Amazon and eHow. And that's considering that 90% of my other pre-2011 KWs are still gone. Every so often it would slip a few positions, but after a few days it would always come back to #1 or #2. It seems to be stuck but fortunately for me, stuck on #1 or 2 whereas the rest is stuck on 50+ if they are in SERPs at all. If I can have a couple hundred of such pages, I could retire! :)
What could be causing this?