definately NTFS but if you have to use macs then external drives and shared partitions need to be NTFS. a program called MacDrive that enables macs to write to NTFS drives IIRC.
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--To every problem, there is a solution (other than death, of course

). So, just smile!!.....okay that's a load of crap but you already know that. 3 years and still fighting!!
Systems:
- Modified Mac Mini: 2GHz Core Duo, 2GB RAM, 100GB 7200RPM HD, Dual-Boot Mac & XP
- HP Tablet PC TC1100: 1.1GHz Centrino, 1GB RAM, 60GB 7200RPM HD, Vista Ultimate