A frequent question is "how significant is a match" of x cM or a GD of 3, or what does a 3rd cousin match look like.

Various folks volunteer their experience. I think it would be cool if we could volunteer our experience in an anonymized way and FTDNA maintain permanent reference tables of this kind of thing. With FF it could be automatic as people fill in known relationships (other than distant cousin). The table could be anonymous - or lumped - here are the average, max, min etc. for this relationship. For Y it would require input from the surname projects.