When an Open Source project arrives at a certain size the discussion about creating an organization / foundation may come up.
It seems however that the common practice is to join an umbrella organization (FSS, Apache SF, etc) for FOSS instead of creating a new one.
Looking at this process the following question arises (to me):
What are the advantages and disadvantages of joining an umbrella organization?
Similar question: When is it necessary for an open source project to be backed by an organization - it seems to only touch on the fund-raising benefits of an organization/foundation in general.