i quite my job in the winter of 2003. i, too, am studying computer engineering after 6 years in the workplace. the difference between us is that i never got an undergraduate degree in the first place: i flunked out of my first college.
of my experiences that would be interesting to you, i can say this:
profesors tend to be very interested in hearing about what is happening in the real world. grab their interest and speak your mind about what you perceive is happening in the field you want to study. you have been closer to that field than most of their other applicants.
secondly, and something you didn't ask about at all, you are now older than most of the other students. i hope this affects you as it did me. every project or task seems more approachable as some part of your mind holds onto the idea that, "if some 20 year old kid (18 in my case) can do it, i can do it easily"!
this fades a bit with time. i have been at umass amherst for 4 semesters and the effect has mostly worn off as i view the rest of the students as peers. it was certainly an advantage in the begining though as with the old saying, "perception is nine tenths of reality". be just arrogant enough to show that you know your experiences are worth something - something the others don't have.
