In May, 2010, I had commented about the Google Public Data Explorer. At that time, I had said that the next step would be to allow users to upload their own datasets to take advantage of this excellent visualisation engine.
This has now happened. See this. At last, I am happy that something really good that I predicted has come to pass.
You can now use this great visualization engine to display your own data in three dimensions, with the third dimension being time.