The Investigative Project on Terrorism
Investigates terrorist activity
Provides resources for research, such as court records, government documents, and multimedia.
This site's profiles of individuals and organizations are heavy on innuendo and guilt-by-association. Comments are taken out of context. Unless you are consciously prejudiced against Muslims (and proud of it), it is probably best to balance IPT information against other sources.
The site was founded by Steven Emerson, known for anti-Muslim views and frequent inaccurate warnings. A web search on Steven Emerson will help you evaluate this site.