[lug] Cross-platform large external hard drive filesystem?

[Tkil]

Not just a Linux question, but it is somewhat relevant.

I would like to have an external hard drive that I could move from
platform to platform (Windows 98/ME/2k/XP, Linux, Mac).
Interestingly, hardware connection is the easiest thing to figure out;
both USB and FireWire are widely supported on those platforms.

My problem is: what filesystem do I use?  I thought I'd try FAT32,
since I know that windows and linux both speak that.  But (1) I wasn't
sure if Mac speaks it, and (2) windows 2k refuses to make FAT32
partitions larger than 32GB [although it looks like it will happily
mount them].  Nothing but Linux understands ext[23].
Hmm... is UDF read-write?  :)

So, I'm asking for suggestions.  I have a 120GB drive that I would
like to use in this application; I could slice it into four partitions
and do FAT32 on each, but that strikes me as nasty.

Ideas?

Thanks,
t.