Cloudalicio.us graphs tag clouds over time.
From Read/Write web, we find that AKAMAI technologies now has tools for visualizing current Internet traffic on-line. AKAMAI hosts a huge amount of Internet traffic by acting as a host for images, videos, and other large files for large corporate sites such as CNN and Apple. AKAMAI's strategy is to house these images locally so that if you are in the New York area and you pull down a site half way across the country, AKAMAI delivers the byte-hefty content from servers in the city rather than 1,500 miles away. Since long distance pipes are more costly than local connections, AKAMAI can save money for sites while improving download times.
Obviously keeping track of Internet traffic is part of AKAMAI's business and they have recently made available online applications showing such data in near real time.
Visit these tools here.