Since I can access FAT32 filesystems from Linux Mandrake, I wondered if the reverse was true. I soon found out that it is (too a limited degree), with some freeware generously provided from http://ext2.yeah.net. However, you will notice some limitations in writing data and that prevuiously hidden files (prepended with a dot '.') are visible in Windows, cluttering folder view up.
This didn't even require a restart, although Windows warns you that installing the driver might muck everything up (I think it's jealous that it now has to share the hard drive with Linux ;))