Poratble HD won't be read by Mac

I've got a large amount of files to swap from my MacBook Pro, running Leopard, to a PC, but my portable Iomega is read only to the Mac, and won't let me write files to it. It's formatted as an NTFS drive. I have a second drive which is in its original Mac format, but this cannot be written to by the PC, although, again, the PC can read it. I have to transfer these files between the two machines, so can anyone tell me of a format that I could use that would be read/write on both platforms?
Many thanks.

FAT32 is readable and writable by both platforms. There are third party software solutions that enable OS X to write to NTFS, but I dont trust'em personally.

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