This is really funny. Visit MyHeritage Face Recognition. It requires free registration. Upload your photograph and it will tell you that you resemble this and this celebrity (also displays the percentage of resemblance).
Now look at my results with different photographs.
Here is the first one
Here is the second one
Here is the third one
Here is the fourth one
Here is the fifth one.
I have tried different images of mine and the results have been stunningly different. It means the algorithm is still not very good. However, it might be the start of searching within the images (Web-based even).
Although I don’t know the names of the most of these people but some computer algorithm suggests that we look alike :P. Have Fun !
P.S. If anyone of my friend tries this, do send me the links to your resemblances as well.