Allow aggregating the same person across projects.
If you have the same person's contributions in the same project listed as two or more people, you can use "alias" to aggregate them into one.
If you are registered to ohloh, and have contributions in more than one projects, you can "I am this person" to aggregate them into one.
What you cannot do is to aggregate the same person that is not member of ohloh across projects. Could you add such a feature?
For example, I know these are the same Paul Eggert, currently at UCLA.
projects/1027/contributors/1355 projects/700/contributors/1355 projects/3868/contributors/1355 projects/3630/contributors/1355 projects/3867/contributors/1355 projects/4141/contributors/1355 projects/3547/contributors/1355 projects/15/contributors/1355 projects/1237/contributors/1355 projects/278/contributors/13265 projects/6802/contributors/1355