A clever module that allows grouping in a view on an attractive way..
If you are in a view and you group in a table view you get something like that ... I have made a view of all content, grouped by content type. The group makes the table structure to break.
If you use this module and you configure it correctly, you get this:
Choose Table Rowspan as format instead of the usual table.
Group .. and check 'merge rows in table'.