Is it just me or are checkbox item fields the most useless thing EVER? I can't get them to do anything in terms of passing a value. Here's how I would think it would work:

1. You would set up an item field as a checkbox to be used an an attribute for your item or category (ie - "this item comes assembled") and give it value (ie - "Comes Assembled") to let your customers know when they're viewing and item that the item comes assembled.
2. You then reference that ID later in your item/category template (like custitem_comesassembled)
3. When displayed on the site, custitem_comesassembled would either pull in the value that was assigned to the checkbox ("Comes Assembled") if the box was checked while editing the item or it would display nothing, or an alternate value.