I've recently been battling this one and I think it would be awesome to do and then put it out there for everyone to use, I mean, a point system is common in a lot of games, and while I still haven't been able to do it quite like I want it to be, I do have some ideas as to how I want it to look. 
  
It should work in a simple way, you click the object and the number of points show up before disapearing, then showing a total of how many points you have at the end of the level. 
  
Example: 
 
  
Help would be appreciated