Andem - 10:42 am on Sep 15, 2012 (gmt 0)
Diversity in search results used to be standard in Google results. They've really messed up their search results and are now backpedaling.
Host crowding was completely removed a few months ago. It made finding something almost impossible. Matt Cutts implied that it made the results better. Now they're trying to improve diversity.
A lot of bad decisions over at the Plex.