A friend asks:
"A guy i work with (let's call him Bob) is trying to do some self-promotion to my boss. In doing so, Bob is providing bad info to my boss, misleading him in a few instance, and just flat out lying in others, all trying to make himself (Bob) look good. Should i tell my boss? How to do it without looking like a bitter competitor?"
Good quesion.
Jim Cuene 
I think that you gotta get Machiavellian (spelling???) on Bob. Figure out a way for the bossman to find out he is full of shit without you being the one to point it out. The rub here is that it takes you stooping to bob’s level to accomplish this. But why not? It’s a dog eat dog world. And you know what??? Fuck Bob!