Geodata now has a much more prominent place on Flickr photo and video pages. The company has also moved things like views, comments, and the number of people who have favorited a photo or video up to the top.
The new drop-down menu for "actions" puts most of Flickr's tools and options into one bucket with easy-to-eyeball icons. Many of these also open up as a pop-over, instead of in a separate page, as they did before, which lets you tweak something, then return to what you were looking at.
Flickr has increased the number of surrounding photos you're able to see if it's in a group pool, photostream, or set. At the same time, it's hidden away the surrounding photos you might have seen from other groups until you click on them. This move saves space and has sped up load time.
Flickr has re-worked its photo tags feature, getting rid of the vertical list in place of a cluster to the right. The company has also gotten rid of the little globe icons, which served as a way to separate a particular tag from just that user--to that tag being used in everyone's photos. In its place are the same options, though now they only pop up when you hover.
The new light box feature is a cross between viewing a picture in full screen and Flickr's Adobe Flash-powered slideshow viewer. It can be summoned by hitting the new magnifying glass button (or just the photo itself), then dismissed by hitting the escape key.
The new size explorer has all the same functionality as the old one, but it has two "medium" sizes--one for the old Flickr at 500 pixels wide, and a slightly larger, 640 pixel-wide version for the new look.