Missedconnections.com has an interesting concept.
There’s no telling how useful this could be once it’s adopted by the masses. Here’s how it works: say you met a friend of yours for lunch, and your friend forgets his cell phone.
You can go to Missedconnections.com and post a message for him, which he will see and know you have his phone. It’s like an online bulletin board, where you can post messages for your friends, people you’ve recently met, and so forth. It sounds a bit like Twitter, but with some enhanced features that really set it apart. For example, say you met someone in a particular city.
You can search for messages from that city, and you might find one for you. The search feature is very well done, in fact, it puts Twitter’s search to shame. There is a safety policy, so you don’t have to be worried about someone broadcasting your information to the rest of the world.
MissedConnections.com In Their Own Words
“A web site to help improve the chances of you meeting your missed connection.”
Why MissedConnections.com It Might Be A Killer
It adds new level of usability to the whole micro-blogging thing. It could take off, especially in bigger metropolitan areas.
Some Questions About MissedConnections.com
Will people use it? Can’t Twitter quickly do this by improving their search? What will they do then? 
