My site: realdoctorstu.com has seen a significant drop in traffic since a Google algorithm update.
It seems pagerank has been affected because Google is indexing both tag archives, category archives, in addition to the actual posts. This is creating a lot of duplicate content from Google's perspective (thousands of pages are indexed, rather than the 200+ posts).
I use Webmaster Tools, although the only way I can permanently remove the realdoctorstu.com/tag/ directory from Google is to make a change to robots.txt (from my knowledge).
The blog I need help with is realdoctorstu.com.