"Ok, before going too much further with this - do you mean journal filtering as in, only some things get published at the reduces the problem, or do you mean filtering as in selecting what papers to read based on which journal they are in. To the first I would say that the evidence is that most things get published in some indexed form eventually (around 70%) so I would argue that at least at order of magnitude level its not much of an effect. On the second - I can only speak to my own experience but the name of the journal has no significant effect on my search behaviour. Difficult to tell whether there is some subconscious effect but I can say that of the papers I've read recently the only ones I can remember what journal (or at least publisher) they were form were the ones I couldn't access… I agree the filtering/discovery problem should be a bigger issue - I also agree that publishers across the board aren't taking it seriously but I'll still take issue with the PLoS should deal..." - Cameron Neylon