How to format drive to share storage space between OS X and Windows?

[Filliam H. Muffman]

I think Apple would need to buy a license to enable OS X to write to NTFS, they generally don't like to do that and it would make Paragon's software obsolete. Maybe they should buy NTFS for Mac?

The alternative is to buy Macdrive for the Win7 machine.

Can OS X read EXT3 formatted drives? Wiki implies exFAT is only OS 10.6.5 and later.