Here's one of many overviews of Flickr's redesign:
http://www.pocket-lint.com/news/121165-old-flickr-vs-new-flickr-what-s-new
Next time you feel that Wikimedia's community is particularly change averse, take a spin through the comments here. :-)
http://www.flickr.com/help/forum/en-us/72157633547442506/
-- Erik Möller VP of Engineering and Product Development, Wikimedia Foundation