This site is designed to take advantage of CSS. If you are seeing this, CSS must not be available or enabled in your browser. Everything should still work, but won't be as pretty. :)
Yes, you can enter URLs with very minimal text, and Simon will fill in the rest when you click OK. It automatically adds the default protocol ("http://") and the "www." and ".com" if necessary.
For example, typing "apple" (without the quotes) will be saved as "http://www.apple.com/". Similarly, entering "dejal/simon" will end up as "http://www.dejal.com/simon/".