Sometimes there are many different companies/contractors/organisation working on a project. It would be easy when cards on a board can be grouped by company/contractor/organisation. The organisation setting per projectmember could be used for this. In some cases it's possible to make a board per company/contractor/organisation but sometimes a project is so complex that this is not a good solution. The same goes for use of the color-label for this purpose. More different sets of labels/tags per card would also be very helpfull when working with complex projects.