vanderdecker wrote:Are checkboxes only in 5.x?
Yup. From Bookpedia - What's new?
[Version: 5.0 (08/11/11)]:
• Added 8 new custom fields: two date fields, two checkboxes, two tag fields (aka multi-value, blue bubble fields) and two regular text fields.
If that's not enough to justify upgrading, you might want to skim through other 5.x changes there to see they pique your interest.