Lying on a resume is a terrible decision (don't say that to michaelochurch!), but nobody expects a resume to be the whole truth. I've seen people get fired because they lied about a degree, or said they were a Senior ___________ when they were not, but I've never seen or even heard of someone getting fired because they left a job off of a resume.
I'm not saying lie, I'm just saying put in the truth that will get you hired and leave out the truth that will stop you from being hired.