StopBadWare.org is a website devoted to helping protect and inform consumers with regards to programs that they download and use on their computers. The StopBadWare blog is a great ongoing report on what's going on in the world of spyware, and they keep data on problematic software to avoid.
From the site:
"StopBadware.org is a "Neighborhood Watch" campaign aimed at fighting badware. We will seek to provide reliable, objective information about downloadable applications in order to help consumers to make better choices about what they download on to their computers. We aim to become a central clearinghouse for research on badware and the bad actors who spread it, and to become a focal point for developing collaborative, community-minded approaches to stopping badware."