ReadWriteWeb reports that Twitter has just signed an agreement with Gnip, a social data streaming service, to offer half of Twitter's total message traffic for $360,000/year. That is, if you want to analyze Twitter data, you're going to have to pay Gnip for the privilege.
With this move, Twitter is effectively outsourcing the "tweet analysis" business. The tweets sold via Gnip are not for display purposes - meaning, if you buy them, you must keep them largely to yourself and be content analyzing them and using the results. Customers like Google, who use 100 percent of Twitter's firehose for displaying instant search results, will still deal directly with Twitter.