Partition to be shared over OSes

[Caio Figueiredo Abecia]

Hi
I have some operation systems installed on a hd in some partitions.
I'd like to know if could I have a partition FAT32 in my hd and let my 
linux/bsd/windows read/write any file there.

To that purpose (share a partition to windows/linux/bsd) what's the best 
solution?

My partition to be NTFS and install on each SO (-win) ntfs-3g ?

Thank you in advance

Caio F.