What does a day's worth of activity look like for Boston's transportation system? Via bostonography, which has been featured previously.
Shifting the Debate. Track the movement across the blogosphere of the top 100 political videos on YouTube with this amazing Flash applet.
We Feel Fine is an art project that finds sentences from blogs and stitches together a real-time picture of how the web community is feeling. The default visualization uses a particle system to show the most recent thousand feelings. You can also build your own set based on criteria, such as gender, age, or location. Click the heart menu and go to Mobs to watch the particles organize in impressive ways. The gestalt of the visualization is compelling, but the details are the best part. Some sample montages. Also see a related project, Love Lines, which uses the same API.
Visual Thinking Weblog. This place is pretty cool, alot of interesting postings there.