It always amazes me as to why Twitter has not bothered with revenue generation. My own idea for helping twitter would not be to inundate the user web pages with ads, but to utilize their search model. They have one of the net's best search for "what's happening currently" and whom to contact for the same? If they are indeed recording the data well, they can quickly target the people who are looking for something with selling something. They would indeed be the ideal platform for advertisers as well. The other idea of course is a long term model of utilizing what people are discussing and maybe partnering with Google to share that data into the Trends =)!
P.S. I am about to get some research done on how we can use Google to utilize Twitter search!