graeme_p - 5:50 am on Feb 17, 2012 (gmt 0)
In the last month I've noticed on every medical search I now find the big few sites, wiki, meds&ape, maybe the NIH. In every instance the independent specialty sites are gone.
Exactly what I have seen in investment and finance. I have heavily lost ground to big, multi-topic sites (including wikipedia). One site that I did not even consider competition in my niche is now raking ahead of me for several keyword.