I use labels for the status of my tasks (e.g. planned, in progress, wait, next action,...). Is it possible to have a filter to see all task and to group them by labels?
Unfortunately, that is not possible right now. You can view each label and the tasks assigned to those, and you can "view all" but they aren't able to be sorted by label at this time.
Please feel free to add this as a suggestion in our votebox. http://todoist.com/Vote/
I would like to view tasks by label and also to be able to view all projects without the tasks below each.
It is possible to do something similar with a little bit of creativity. If you know what labels you want to see you can create a filter that will group those labels.
I group all my @support tasks with the status of the task like this:
@new & @support, @in_progress & @support, @wait & @support, ...
Every part of the filter (between the commas) will be a group.