TwitPicGrid
PicFog - real-time image search
Top Trending Pics - Twicsy the Twitter Picture Search Engine
PingWire - Latest pictures posted to twitter in real-time.
Mozzler - Real-time news, images, videos and chat
Twitter Pics: 4 Tools to Track Twitpics in Realtime
Twitter Pics: 4 Tools to Track Twitpics in Realtime
5 Impressive Mashups of Twitter and Flickr
Flittr, picture your words.
Twitter Image Search - PicBrk
twittervision
How Twitter's Expanded Images Increase Clicks, Retweets and Favorites [New Data]