Thank you very much, It really means to me when I see that I succeeded to spark interest in someone who is not actually from this profession :)

Well beside that we can use them as a classifier like I showed in this article with concrete example of its application, they may find use practically everywhere - for example in medicine to help us to determine the disease of a patient, in a business to find some correlation between the data etc.
There is one interesting use - they can be used to reconstruct 3D function, and that can be helpful for face recognition!
I plan to write about these things more in the future, so stay tuned :)