David, I've never used pgMac and I don't know anybody who has,
though it's possible I posted a link to it if I saw it somewhere at
sometime. (I honestly don't remember whether I did or not.)
Regarding the CMS, I think the problem is that it's a pretty large
undertaking--big enough that the typical (relatively small)
OpenACS shops probably couldn't just go out and put in the time
to do it right without fairly significant client sponsorship. Now, if
somebody had the dollars to fund the initial development, I think
you'd see a lot of community energy going into maintaining and
enhancing the output of that first sponsored effort.
That's just my own guess, though.
