I don't think you should ever have to chase a recruiter. In a company like that, where all they care about is placing someone, if you fit what their looking for, they'll be all over you. If he hasn't called you back, I'd guess he either filled it or doesn't actually think you would get hired. And an earlier poster above hit it right on, these guys are judged every day on phone calls and time on the phone, so he could have just been making a dial. I think the other issue with these big companies is the person trying to fill the position is not the person talking to the employer (usually) so they just have a brief description of what is wanted.