Oh cool, I just found out about USB mining and now there's a thread!

I have some questions, though..
1. Where does one purchase USB miners?
2. What is they power and/or resources (CPU, RAM?) usage?
3. Are they worth it? I have in mind that I would like to mine altcoins, namely LTC I think.
You almost hit the right thread, this one is for what it takes to power them.... Try
for all your answers. These days stick miners are only good for Solo Lottery mining as they are too under-powered for most pools to accept.
btw: the sticks ONLY do Bitcoin -- not altcoins.