So, a colleague at another university and I agreed to collaborate on a series of papers 5 years ago. To avoid clashes in style, etc. we agreed that I would write a couple and he would write a couple, with us both commenting and editing each other's. So far, so good. I produced my couple of papers in the first year or so and these were published with me and my colleague as first and second authors, respectively. I was expecting to see the same from my colleague but didn't. I have been waiting ever since for them to materialise but they haven't. We have repeatedly set deadlines, which come and go, with my colleague saying he has been very busy (teaching, marking, blah, blah) but that he'll get to them in a couple of weeks. 5 years later, I am still waiting to see something but I think it's now safe to say that I have been well and truly shafted.
Does anyone else have any experience of this behaviour and, if so, what, if anything, have you done about it? I am on the verge of writing a rather snotty email to this individual's manager to point out the retched state of affairs as, after all, it doesn't reflect at all well on his institution even though they have benefited from having their institution's name on effectively my work.