YouHaveIWant

Claiming it's "revolutionizing traditional classifieds", simply submit a Twitter-length "Want" or "Have" posting and YHIW'll do the searching for you, sending you any potential matches in real time, useful whether you're wandering a concert parking lot looking for last minute tickets, or wandering a bar looking for "a match for...the next few minutes in the bathroom", though wouldn't some air freshener work better.