A temperature gun!!! The amount of noobs asking "what should my gearing be?" is absurd. You already include poopy nimh batteries and poopy chargers, how about something useful? I'm sure you guys could buy them for like $3-5 a piece to include in all RTRs. I love how the manual says to keep brushless motors under 200*, but gives you no way of checking.
Sig edited for awesomeness. NC