The official documention for the CronJobDetail object lists only 6 job types.
Data Export (0) Dashboard Refresh (3) Reporting Snapshot (4) Scheduled Apex (7) Report Run (8) Batch Job (9)
There are clearly more Job Types. I have a Job Type "A" which coordinates to "Reporting Notification". It looks like it is related to subscribing to get report notifications.
Does anyone have a full list of Job Types? It does not seem that Salesforce provides this in detail.