I would like to compile a list (perhaps eventually resulting in a wiki) of notable efforts in collaborative type design. Team77 comes to mind as a very good example. A more contemporary instance would be Majoor and Buivenga.
The distribution of work can be anything: glyph design versus spacing versus hinting, Latin versus Arabic versus Cyrillic, conceptualizing versus sketching versus digitizing, etc. However I would like to exclude cases where the collaboration was inescapable - for example the yesteryear collaboration between a type designer and a punchcutter. I'm looking for cases of collaboration where the typeface could have been done by one person, but people elected to collaborate anyway.