While wandering through the internet here recently, I came across a NASA/JPL website devoted to the extended Cassini mission to Saturn. The site is really well put together, and is a great example of what the web should be all about.
In addition to providing all the information you would ever want to know about Saturn, the website includes a virtual tour of Saturn, courtesy of the data being returned by Cassini. After downloading the software (which is only available for Windows and Mac.. Arg!) you can show Cassini's position now or at any time in the past or future, as well as interact with the spacecraft itself by draging it around with the mouse.
I highly recommend taking the time to visit the website and play with the software. It is truly awesome! Check it out! Cassini Equinox Mission: Cassini Virtual Tour