EDA fast solutions (forum, might be down) The place for OrCAD and EDA knowledge sharing. The "OrCAD Libraries Sharing Center" section of the forum has libraries (FPGAs and DSPs mainly). Great job, Ilan! UPDATE: this forum could be gone for good. I couldn't view it for months. Luckily, I have squirreled away all the libraries from that forum. He-he. http://www.edafastsolutions.com/forum/
ExpressPCB support group A similar group dedicated to ExpressPCB library exchange. ExpressPCB is a free schematic and layout packge. While it's free and easy to learn, you are limited to only one (1) PCB manufacturer. http://groups.yahoo.com/group/expresspcb/
International Electronics Forum Center This forum deals with most of the EE questions. Among others, there is a section on PCB software and PCB design. You can also find the pirated IPC standards available for free download there. http://www.edaboard.com/