Fees/Taxes on Each Block Found Haven't found a clear answer to this, but I have heard that various coins charge a sort of "developer tax". I've looked through a bunch of various crypto's sourcecode, but I haven't found any hints as to how it's implemented, let alone in what portion of the code it would be in. 
Could someone reveal a little sunlight onto this behavior?
Some mining programs (designed for use with mining pools) will mine on behalf of the mining software developer for a short time, before switching to the actual user account.

I've only seen this once and I don't even remember which coin it was for, so I don't know how widespread it is.