In my last post, valancy expressed interest in our custom of cleaning for Passover. Before the holiday, gnomi and I, along with many other people we know, clean our apartment quite thoroughly. The best source for Jewish customs and traditions on the web is http://www.jewfaq.org, and for those who are interested, the following is quoted directly from their page on Passover (or Pesach) at http://jewfaq.org/holidaya.htm.
Probably the most significant observance related to Pesach involves the removal of chametz (leaven; sounds like "hum it's" with that Scottish ch) from our homes. This commemorates the fact that the Jews leaving Egypt were in a hurry, and did not have time to let their bread rise. It is also a symbolic way of removing the "puffiness" (arrogance, pride) from our souls.
Chametz includes anything made from the five major grains (wheat, rye, barley, oats and spelt) that has not been completely cooked within 18 minutes after coming into contact with water. Orthodox Jews of Ashkenazic background also avoid rice, corn, peanuts, and legumes (beans) as if they were chametz. All of these items are commonly used to make bread, thus use of them was prohibited to avoid any confusion. Such additional items are referred to as "kitniyot."
We may not eat chametz during Pesach; we may not even own it or derive benefit from it. We may not even feed it to our pets or cattle. All chametz, including utensils used to cook chametz, must either be disposed of or sold to a non-Jew (they can be repurchased after the holiday). Pets' diets must be changed for the holiday, or the pets must be sold to a non-Jew (like the food and utensils, the pets can be repurchased after the holiday ends). You can sell your chametz online through Chabad-Lubavitch. I have noticed that many non-Jews and non-observant Jews mock this practice of selling chametz as an artificial technicality. I assure you that this sale is very real and legally binding, and would not be valid under Jewish law if it were not. From the gentile's perspective, the purchase functions much like the buying and selling of futures on the stock market: even though he does not take physical posession of the goods, his temporary legal ownership of those goods is very real and potentially profitable.
The process of cleaning the home of all chametz in preparation for Pesach is an enormous task. To do it right, you must prepare for several weeks and spend several days scrubbing everything down, going over the edges of your stove and fridge with a toothpick and a Q-Tip, covering all surfaces that come in contact with food with foil or shelf-liner, etc., etc., etc. After the cleaning is completed, the morning before the seder, a formal search of the house for chametz is undertaken, and any remaining chametz is burned.