Multiboxing professions? Should I get all professions?

[Cooolr]

I was wondering what you guys do and what I should do when you have a 5+ boxing team in terms of professions.
I don't think you need more than 1 char with herbalism as an example.
So do you get all the gathering professions and then what others?

edit: or is there maybe one important profession for you that everyone has to have, e.g. engineering.
Something that only lets the char with that profession use?

ahh damn I might have posted in the wrong section - i won't repeat.