1. Rebbi Eliezer (Mishnah): A person cannot declare all of his possessions to be "Cherem." Such a declaration is invalid.
2. Rebbi Elazar ben Azaryah (Mishnah): The fact that a person is not allowed to consecrate all of his possessions shows that the Torah wants one to take care of his possessions and not waste them.
3. With regard to consecrations to Cherem, there is a difference between consecrating movable objects and consecrating land.
4. There is an argument in the Mishnah about who receives a pledge given merely as a "Cherem."
5. If a person says that his animal dedicated to be a Korban is Cherem, his statement is valid.
A BIT MORE
1. Rebbi Eliezer (Beraisa): The verses that discuss Cherem imply that one cannot even declare all of his servants, all of his animals, or all of his fields to be Cherem. If he does, the declaration is invalid.
2. The difference between Rebbi Eliezer and Rebbi Elazar ben Azaryah is Rebbi Ila's law that a person should give a maximum of twenty percent of his income to charity. Rebbi Eliezer merely deduces that one may not dedicate *all* of his possessions of a certain category. Rebbi Elazar agrees with Rebbi Ila's law of up to twenty percent.
3. A person who consecrates movable objects as Cherem may give them to any Kohen he chooses. A person who consecrates land as Cherem must give it to any Kohen from the group of Kohanim serving in the Beis ha'Mikdash at the time he made the pledge.
4. Rebbi Yehudah ben Beseirah: Hekdesh receives the pledge. Chachamim: The Kohanim receive the pledge.
5. Although the animal is offered as a Korban, if he dedicated it as a Neder ("Harei Alai") he must pay the full worth of the animal as Cherem. If he dedicated it as a Nedavah ("Harei Zu"), he must pay the amount of money that a person who is not obligated to bring a Korban would pay if he saw an animal of this quality on sale for the purpose of bringing as a Korban (much less than its regular value).