Just had a look at 2 video clips from the launch of the new look alamy site.  Didn't know they put 89% of their operating profit in to medical research in their own lab.  They also claim to have a faster site than Getty and istock.

http://www.alamy.com/Blog/contributor/archive/2010/04/23/4813.aspx

Didn't know about the medical research either.
It hardly matters that the search is faster, when it usually returns such a poor match because of not having a CV, 'stealing' words from the contributer's name (if you were called Tray London, all your photos are going to appear in every search for London or Trays (well, not literally trays, as Alamy counts tray and trays as separate words) etc.