I recall in previous versions (Or maybe even this version and mine is just bugging) you could take text or int fields and supply a list of key|values and make checkboxes or a selectbox from it.
The core module "Options" seems to offer this functionality from the module description but whenever I select field type Integer, Decimal, Float, or text the only widget option I have is a standard textbox.
Term and node references do allow checkbox widgets.
Am I seeing a bug? Is there a different way of doing this in D7? I've tried adding these field types to both node types and vocabs but neither acknowledges the existence of the checkboxes widget.