Hi Phil, hi Stefan,
thanks for your kind reply!
I am happy of seing that I shall not be alone with the Arduino robot I am about to buy.
Your projects are both very interesting!
I have also seen, from other questions in this forum, that other people begins to work on the bot, and in point of fact extendability seems to be a concern (see, for instance, the question about the wifi shield, that Stefan succeeded in connecting: Stefan, plugging-in cards and wires to establish connections was enough, or did you have to solder as reported at http://arduinorobothelp.wordpress.com/ ?).
Phil, did you receive your components? Are you setting up your Braitenberg vehicle? I'll be very glad of knowing more while you get it working!
By the way, I was surprised by JianyuanMa's question about encoders: he is probably referring to another Arduino robot, not the "official one", isn't he? The Arduino on wheels has no encoders, I think, or am I wrong?