Doing some advertising for a new-to-me networking site around product management, Catalyze. They appear to be focused on usability and business analysts, but product management is in their larger world. Here is their boilerplate introductory material.
I just joined the Catalyze community and I thought you would be interested too. Catalyze is a new member-driven community for professionals engaged in defining business systems, designing software applications and creating websites. It is a place to share experiences, find resources, ask questions, offer opinions, get involved and network with other professionals doing this same creative work.To join, go to
http://mycatalyze.org and select the Register link in the upper right corner.
I find it somewhat entertaining that their "about" text on the home page is a picture of words.
Here are some other product management resources I've found recently. There are plenty more to be found...