As I said there's no evidence to suggest either way. We will perhaps never know the answer to this, and almost certainly will never know in any of our lifetimes. One would assume due to the universe being so vast, there's a high chance there is other 'life' but because we have no evidence we cannot say is true. Likewise there is no evidence to refute the claim that we are not alone.
Some of you may find this interesting...
http://www.nikon.com/about/feelnikon/universcale/index_f.htm