[ale] A good cross-POSIX filesystem or two?

[ale at FultonGreen.com (Fulton Green)]

Real Soon Now, I'm going to attempt to repartition the hard disk on my
recently reacquired AMD-based workstation tower. I'm planning to install the
following operating systems:

Windows XP Professional (refreshing it every 30 days ;-)
Red Hat Linux 7.3.92 (the latest beta code-named Limbo)
Debian GNU/Linux unstable branch
Gentoo
FreeBSD 4.6-RELEASE
FreeBSD 5.0-DEVELOPMENT (or whatever their branch tag is)
NetBSD 1.52
Debian GNU/HURD

So I'm a sucker for punishment. ;-) I'm thinking GRUB is up for the task,
though (but I am a bit nervous about the HURD install).

Anyway, any suggestions for data partition-sharing? I'm thinking so far:

- one FAT32 data partition for between Windows XP and Red Hat
- one ??? data partition between the Linuxen and the *BSDs
- one ??? data partition for file transfers between HURD and the other
  POSIXen

I wasn't sure, for example, if even FreeBSD could do ext3, or if I should
just go for UFS for the second partition. I also didn't know what would be
the best (i.e., least corruptible) FS for HURD.

TIA.

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