It took a while, but Flickr finally has an Android app. It provides plenty of browsing, uploading, and sharing features, much like its iPhone counterpart. Additionally, Flickr has added a neat feature called Photo Sessions, allowing you and your friends to view a slideshow of photos at the same time.
It includes text chat, so everyone can communicate, plus you can shift control of the slideshow to any participant. When your friends and/or family are not in the same place and want to look at photos together, it looks like a pretty slick way to get the job done. Hit up the Flickr blog for all the details.