I linked all the composer pages, although we need to check pianosociety every once and a while.
Also, I was thinking that maybe we could have a link in the Submit File form that would go like "Submit Recording" and it would lead to a page which would explain the collaboration between pianosociety and imslp, and it would give instructions as of how to upload a recording on pianosociety and then link to it from IMSLP and vica-versa. On pianosociety too there could be a page that would explain how to upload a score to IMSLP (just by giving a direct link to the "Add Composer" page or something, or by giving a link to one of the submission guide/guidelines pages).
I guess linking to each individual work is going to take a while, although not too long, as, for example, only one link would be required for all of the Well-Temped Clavier, and not 24 links from both sides.
Moreover, there are some contemporary composers on pianosociety who have uploaded some recordings there, so I was thinking about contacting them and suggesting them to upload the scores to IMSLP.
Lastly, I'd gladly be an "ambassador" if you people think there is a need for one. I'll start linking the individual work pages to the work recordings on pianosociety and I will contact the pianosociety admin and ask him to do the same (it's pretty pointless to have 24 score links on the Well-Temped Clavier, all linking to the same page on IMSLP). I am willing to do the linking from the pianosociety side too, if he thinks he's not going to have too much time to do it.
I think that the pianosociety-imslp collaboration will greatly increase traffic on both sites and it will give a new dimension to IMSLP for its frequent visitors