I've never heard of it either, then again, I'm hardly a professional photographer, really more of "some guy with a nice Nikon and a little infinity table".
Maybe it was absorbed by Adobe Stock when they really started pushing that service?
The most recent article I can find about it is from 2007 but looks to be a rehash of the 2005 announcement.
OHH it's seems a nightmare!!
I did't checked from 2 years, but if you go here
and choose my Contact page...look at the end the logos ....the first one on the left .... it was the logo of photographers directory, and it was linked to my Adobe Professional PROFILE PAGE!!!!!
I accessed by inscription from TAU VISUAL, the Italian professional photographer association!!
Your web site is all in Flash!? Sorry I can't see anything. And neither do most people these days. Flash is a dead web technology.
I think Adobe Photographer's Directory is the least of your worries. You really need a new web site coded in HTML5 and CSS.