stock photo's

One of my tasks today was to browse through some stock photography sites in search of a specific style of photo. After checking out Veer, Getty Images, and several others I kinda feel like Getty is the only one to really nail it in terms of photography browsing. The loads of categories you are presented with to search for images based on whatever it is that you are currently viewing is super user friendly and hasn't been picked up on by any other site that I've encountered so far. Anyone else have any stock photography experiences they care to share?