But what are the other coins? If f.exampel BTC=dollar, is LTC=cents or is LTC some other kind algorithm?
And can you use USB ASIC for both BTC and LTC and other coins?
In theory any cryptocurrency based on the 256SHA hashing algorithm they should work with. The chips do nothing more then do math of a specific type. As far as I know LTC and others like it are all based on the same algorithm's, and why would they not be it would be the death of it because no-one would reinvest to rebuild new hardware for it. Once burned twice shy, no-one would even try it, they would loose before they started.
These chips are worthless for anything else but what they specifically designed to do.
And sorry yes at 40 cents USD it would be hard to do outside doing it as a hobby right now even with the newer coins I think.