Personalized Search. A lot has been written that while Google's strategy to make the world's informations available is a good start, it misses user relevance. Given that many of us actively share our preferences on sites like Twitte, FB, Blippy, and FourSquare, the web ought to know that (for example) I am a coffee-drinking, author, technologist, regular hiker, active reader, shoe shopping, poetry lover, sometimes backpacker, Francophile, and mom. But searches today don't take advantage of ready available information to personalize content (or advertising). The company (ies) that can take advantage of personalization acros the web (vs. netflix or Amazon which do it topically) could create a new model. Example is Gravity. Good article on former MySpace exec Amit Kaput in BusinessWeek.
Society is made up of competing goods that can’t be resolved in any perfect way — freedom vs. liberty, state secrets vs. citizen oversight — but the solutions to those tensions always take place in a particular context. Sometimes a bargain is so robust it lasts for centuries, as with trial by jury, but sometimes it is so much a product of its time that it does not survive the passing of its era.