During the course of a day, the average person who works at a desk deals with torrents of information coming from many sources: e-mails, Web searches, calendars, notes, spreadsheets, documents, and presentations. Sorting through the information is tough, and for the most part, it’s done in an ad hoc manner. But in the next couple of months, there may be a better way. Radar Networks, based in San Francisco, is releasing a free Web-based tool, called Twine, that it hopes will change the way people organize their information.