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Did anybody buy stuff from www.robotstore.com?

I've bought two motors (no gearbox, just motors), hooked them up and expected it all to be a little bit "nervous". However, they can't move even that little thing, only can spin in the air.

So... what would you guys recommend? Could anybody just give a little explanation, like "Motors FAQ for dummies"?

Thanks!

Here ( http://letsmakerobots.com/node/80 ) Frits had mentioned that either Arduino or PICAXE can control such and such number of servos. I'm pretty new to microcontroller world, so maybe my question will sounds a bit stupid... but I don't really get what we mean by saying "can only control X servos"? Does it actually mean, "platform X can have up to N serial outputs"? Because, AFAIK that's what servos are, aren't they?

Now, I can understand that PICAXE has also limitations due to the built-in Basic interpreter; but why Arduino?