Since I had good luck last time (http://letsmakerobots.com/node/7046) - I will try again.
This time, it is batteries.
As I was just talking with Gareth about, it is a shame that all the used mobile phones get thrown away, with nice LiPo batteries, even chargers.
And you can get really cheap LiPo's if you get some that should be sold as spare batteries to common cel phone types, or outdated models.
What I would like, would be a HOLDER and second a CHARGER. This would open a world for us!