AdMob has a strangely addictive mashup they call the AdMob AdMonitor. Once a second, it reports the number of requests to its network (while I was watching, that’s 3000-8000), randomly selects one, and displays its device, network, and country. Then repeats, jumping around the globe.
What’s interesting is how few iPhones are showing up and how few non-Nokia devices show up outside of the US. In the meantime, I really need to close that page before it takes up too much of my day.