JIRA 3 has a new custom field system, and we need some sort of tutorial document taking the user through the process of writing a custom field. Some possibilities for a worked example:

• A CF that exposes something in the change history (eg. first record - Bugzilla import id?)
• A CF containing the user who last commented
• A CF that shadows an arbitrary field, but only makes it visible to certain users
• A new CF type (eg. boolean checkbox field).
• A CF that exposes a value from an external database (eg. looking up customer details for the issue reporter, or mapping JIRA keys to work orders).