Answer:
   
   The Union of Orthodox Congregations maintains a FAQ at
   [5]http://www.ou.org/kosher/primer.html, which would be a good
   starting point. For Pesach, another good source is the Official
   Rabbinical Assembly Pesach Kashrut Guide at
   [6]http://www.rabbinicalassembly.org/info/pesahguide/index.html. Some
   other good sites include:
     * Why keep kosher? From the National Jewish outreach program
       [7]http://www.njop.org/html/Newsletters_and_articles.html#a3.
     * An Introduction to the Philosophy and Laws of Immersing Vessels
       (traditional). [8]http://www.innernet.org.il/tevilah.htm.
     * The Official Masorti (Israeli Conservative) teshuva on Pesach and
       the use of kitniyot
       [9]http://www.masorti.org/responsa/kitniyot.html.
       
   Another way to learn is to read some of the books in the [10]reading
   list (Part 2, "Traditional"), and subscribe to some of the
   periodicals. In particular, we recommend the following books:
   
   [Dre59]
          Dresner, Samuel H; Siegel, Seymour. The Jewish Dietary Laws.
          Burning Bush Press, New York. 1959. United Synagogue Book
          Service; 1980. Paperback. ISBN 0-838121-05-5.[Conservative
          authorship. The book presents liberal positions on ingredients,
          wine, cheese, gelatin, swordfish. Among Conservative rabbis,
          the book reflects more lenient views.]
          [11][Buy at Amazon:
          http://www.amazon.com/exec/obidos/ASIN/0838121055/socculturejew
          ish/] 
          
   [ForXX]
          Forst, Binyomin. The Laws Of Kashrus. Artscroll Mesorah.
          Hardcover. [A comprehensive exposition of their underlying
          concepts and application]
          [12][Buy at Artscroll:
          http://www.artscroll.com/linker/socculturejewish/ASIN/LOKH] 
          
   [Gre85]
          Greenberg, Blu. How to Run a Traditional Jewish Household
          Paperback reprint edition (September 1985) Simon & Schuster
          (Paper); 1985; ISBN 0-671602-70-5. Jason Aronson (Hardcover);
          1989; ISBN 0-876688-82-2.
          Paperback: [13][Buy at Amazon:
          http://www.amazon.com/exec/obidos/ASIN/0671602705/socculturejew
          ish] ; Hardback: [14][Buy at Amazon:
          http://www.amazon.com/exec/obidos/ASIN/0876688822/socculturejew
          ish] 
          
   [Lip88]
          Lipschutz, Yacov. Kashruth: A Comprehensive Background and
          Reference Guide to the Principles of Kashruth (The Artscroll
          Series). Mesorah Publications Ltd.; 1988. Hardcover. ISBN
          0-899065-58-9.
          [15][Buy at Amazon:
          http://www.amazon.com/exec/obidos/ASIN/0899065589/socculturejew
          ish/] [16][Buy at Artscroll:
          http://www.artscroll.com/linker/socculturejewish/ASIN/KASH] 
          
   [Lub89]
          Lubavitch Women's Organization. Body and Soul: A Handbook for
          Kosher Living, Lubavitch Women's Cookbook Pub, NY. 1989. Bloch
          Pub Co; 1997.Paperback. ISBN 0-826602-39-8. [Short introduction
          to kosher basics.]
          [17][Buy at Amazon:
          http://www.amazon.com/exec/obidos/ASIN/0826602398/socculturejew
          ish/] 
          
   [Lub90]
          Lubavitch Women's Organization: Blau, Esther; Deitsch, Tzirrel;
          Light, Cherna. Spice and Spirit: Complete Kosher Jewish
          Cookbook. Lubavitch Women's Cookbook Pub, NY, 1990, 1997.
          Hardcover. Reprint edition. ISBN 0-826602-38-X. [Contains
          detailed information about the laws of kashrut and holidays
          from the Lubavitch point of view and thus follows Lubavitch
          customs regarding Kashrut; for non-Lubavitch, use in
          conjunction with other Kashrut references. Lots of traditional
          recipes that tend not to fail, if followed. Good section on
          Passover baking.]
          [18][Buy at Amazon:
          http://www.amazon.com/exec/obidos/ASIN/082660238X/socculturejew
          ish/] 
          
   [Wag00]
          Wagschal, S. The Practical Guide to Kashruth. Philipp Feldheim;
          2000. Hardcover. ISBN 0-873065-61-1.
          [19][Buy at Amazon:
          http://www.amazon.com/exec/obidos/ASIN/0873065611/socculturejew
          ish/] 
          
   Also, every Jewish household, if you're at all interested in Kashrus,
   should subscribe to Kashrus Magazine, published by Yeshiva Birkas
   Reuven. For information, contact Kashrus at P.O. Box 204, Brooklyn NY
   11204. You can call (718) 336-8544 for Visa/Mastercard Orders. Email:
   [20]kashrus@aol.com. You can also visit the Kashrus website at
   [21]http://www.kashrusmagazine.com/.
   
   There are also a large number of Kosher Shopping Opportunities on the
   web, including [22]Kosher Supermarket
   ([23]http://www.koshersupermarket.com/), [24]Wholesaleportal
   ([25]http://www.wholesaleportal.com/), [26]Kosher Finder
   ([27]http://www.kosherfinder.com/), [28]Kosher Foods Depot
   ([29]http://www.kosherfoodsdepot.com/), [30]Kosher Cornucopia
   ([31]http://www.koshercornucopia.com/), [32]Kosher Club
   ([33]http://www.kosherclub.com), and [34]Kosher Fest
   ([35]http://www.kosherfest.com/).