Of course, one should not use such research as an excuse to eliminate choices (as many political types believe). All you need to do is hide the other choices.

A great example of this is the choice of "Desktop or server?"

http://www.ubuntu.com/

In fact, that's barely even a choice. But if you want to choose between other options, you can (at the cost of an extra click):

http://www.ubuntu.com/products/

In my view, this is the proper way to deal with too many choices.