Just a random thought: I’ll bet TinyURL has seen a spike in usage since Twitter came along. I’m seeing a ton of tweets with TinyURLs embedded in them. If anyone reading knows anyone associated with TinyURL, feel free to comment on my idle speculation…
Update: well, I just went to the TinyURL site (to make a self-referential TinyURL for this post) and discovered they do 1.4 billion hits a month, so I’m guessing Twitter isn’t yet moving the needle that much.