Does anyone have anything more to share about removing thin pages?
Yes. I've noindexed about 1500 pages where I thought the content was either thin or borderline thin. I based my decision upon a visual review, but also checked to see if those pages were receiving Google traffic, or if they'd been pushed down significantly (using Firefox rank checker as a guide).
Immediately after Panda, and continuing in the weeks after, Google dropped from 44% of my referrals down to 28%. It stayed at 28%, plus or minus 1%.
After all of this noindexing, Google has dropped to 21% of referral traffic. I can see from the Rank Checker that I've lost rankings on the very few phrases that were on page one post-Panda. I also suspect that pages that I've noindexed were receiving Google traffic. To try to find them, though, would be like the proverbial haystack needle.
With nearly half the site noindexed, the remaining pages have good content (I think), including things I've added such as customer reviews, my own product critiques, videos, history of the widgets, performance charts, and anything else I can think of to make them unique.
With Google not bringing back any sites (that I'm aware of), it's impossible to know if I'm doing the right or wrong thing. That's infuriating. There should be a secret code or something. Maybe an email that says "John has a long mustache" or some such, so the site owner knows he's done the right thing.