In the same way that questions which are obviously homework get tagged homework, should questions which are obviously attempts to get someone else to do the questioner's job for them be tagged do-my-job-for-me?
I'm not even sure whether I'm joking or not... with a decent tag wiki entry it might even become a useful user education tool.
-1
on these sorts of questions should work nearly as well. Down votes on questions are "free" (as in reputation-flavored-beer) so there is no loss incurred.