Dexter industries have shown how to use their Dexter wifi sensor, in combination with web sockets, to control a NXT robot directly from an iOS device (iPhone or iPad) or an Android. You can read more at their blog post.
I’ve been a big fan of John’s work at Dexter Industries (as you can tell from how many of his sensors I’ve used in my projects!) Now you can read a great interview with him in Make magazine!
leJOS is also well suited to teaching the basic principles of object-oriented programming; it is Java after all! And what better way to illustrate in concrete terms how powerful Java is than by applying it to building robots?