Hi, Richard. Install the Mobile Player on your iPad first. (Otherwise, it plays in Safari HTML5, a less than satisfying experience.) Then, when you access an SL project on the internet in Safari, the Mobile Player will get called to play the content. And since you can download and store the file on your iPad (allowing offline viewing), it really does the job quite well.
It's a great way to sell iPad playable content without having to go through Apple's appstore. (That always bugged me!)