Anhdres told me about this great tool from the University of British Columbia, it is called AutoStitch and is a free program and there are no complicated things you need to do. All you need is some pictures that have some kind of common connection to one another to create a panorama. These two shots are from two different locations. The day time shot is from the goverment offices I visited the other day. The night time shot is from Tokyo Tower. Click on the image to enlarge.
In the night time shot the white lights on the right is Ginza, where my hotel is and the white lights on the left are Shinjuku, where the day time photo was taken.
I also created this 360 degree panorama myself, the city looks never ending in all directions –