WorkRoll Bug Tracker   
http://www.workroll.com

Web-based bug tracker with Windows installer app server included in download (or use your own). No database required. Installation and use are fully web-based. Features include: sorting; filtering, file attachments; tiered access; e-mail notifications; import/export; organize by project, status, priority, assigning user, assigned-to user, due date, dev instance, version; restrict users to specific projects or to read-only status.