I, like many of the previous responders, say that "I work with computers". Inevitably I get the "Could you help me with...", but I don't mind for the most part.
I am by trade a "Computer Consultant" or a "System Administrator". I don't even consider myself good enough to call myself anything more grandious. I do agree with merlyn. Like him, I own my own company of one. I like the idea of calling myself a "General Manager". This is a very broad title that covers a large area of things. Unlike merlyn, I am ultimately subcontracted to the government (US)/(I guess that last statement is supposition, as I do not know anything about merlyn's contracts!!). Anyway, I either say that "I work with computer's" or the consultant thing, because it usually draws a big question mark over someones head and they don't usually ask me anything more about it. A lot of what I do has a 99 year non-disclosure clause that makes it hard for me to talk in specifics, so I like to keep that end of it brief. Besides, if I can create a bit of mystique around what I do, so much the better.
Paulster2You're so sly, but so am I. - Quote from the movie Manhunter.