Conni,
> Could somebody please tell me where the location for downloading
> PostgreSQL for Mac osx is? Somebody asked for it and I didn't find it.
You can install it from source on OSX.
Entropy.ch makes Mac packages for OSS software. However, he has not yet built
a package for 7.4. It might be helpful for someone to request it, and even
make a donation to Marc L. to encourage him to pack it up:
http://www.entropy.ch/software/macosx/postgresql/
--
Josh Berkus
Aglio Database Solutions
San Francisco