The blogger at Life of a Lab Rat is now stricter about whose name goes on a paper. Simply, he writes that if you work on his project you’ll be on the paper and if you do the writing as well, then you’ll be first author. If you help out by supplying a reagent or proofing the paper, he’ll give you an acknowledgment. But what he says he won’t do is put someone’s name on the paper because that person is important.