Second hand tech usually go the way of Craigslist or eBay. One is a den of cheapskates and scamsters, and the other is a den of cheapskates and thieves. What's a guy to do? Perhaps this new Flippid service is the solution.
How it works: sellers list an item with a price and appropriate tags. If someone likes the price, they can buy it right away. If not, buyers can list items they want with the appropriate tags, and if a seller likes the price, they can choose to sell to the buyer. Matchmaking and Web 2.0 bliss. There are even RSS feeds for easy tracking.
So far the site only has a couple handfuls of products, but may shape up to be something pretty decent if there are enough users on there.