There are more than a couple of attempts at this. First is CoderWall - It basically let you list each software/engineering achievement and gave you badge for it

There are more than a couple of attempts at this. First is CoderWall - It basically let you list each software/engineering achievement and gave you badge for it. Another one is Skills.To by Joshua (founder Delicious). It's a bit of an abstraction vis a vis your idea, but its definitely in the neighbourhood. EDIT - Remembered the name -> CoderWall :P