COUNTER MISSIONARY LINKS
The MessiahTruth Project is an excellent resource for counter missionary information. They also have a bulletin board where you can ask questions, or just discuss.
Outreach Judaism is one of the main Countermissionary organizations. The director is Rabbi Tovia Singer, a person who I have worked with countering missionaries for almost 10 years.
Jews for Judaism is one of the main Countermissionary organizations. Over the last two years I have been working on various cases with Jews for Judaism staff members.