CRC guide to kashering items in the kitchen
The title describes this well. I've found hard to find books here in the past - they also will make custom reprints of out-of-print books.
The J-Law website features articles on the interaction of Jewish Law and secular law
Halakhah articles by Rabbi Jachter
Never be cold at Shaharit
Cut and paste-able Tanakh and Mishnah, Bavli, and Mishneh Torah
National Association of Chevrei Kadishah
Incredible website collecting piyutim and zemirot - both words and melodies - searchable by author, region of origin, or associated holiday
Guide to rashei teivot (from Princeton University)
Index of articles in Torah / Halakhah Journals published by the Bar Ilan respponsa project folks
new Hebrew translation of Rambam's Moreh Nevuhim published by Tel Aviv University - fully cut and paste-able
Transcript of panel conference on Rav Soloveitchik's "Confrontation" - this is a great resource for interesting Orthodox thinking on interfaith dialogue.
Strategy think tank about Israel
Links to primary documents relevant to the study of Jewish history
The first fully interactive, online Yeshiva and Midrasha