Q:

What Windows ext3 driver should I use? 

I understand that there are several alternatives for using/accessing ext2/ext3 in Windows, such as those described in a HOWTO Forge article and in a another article from a year ago.   However, none of the listed items provide full read-write access to a fully implemented ext3.   That is, the two read-write options seem to not support the ext3 journal.   (ext2fsd will replay a non-empty journal, but otherwise doesn't use it, it looks like.   ext2fs.sys doesn't seem to use the journal at all.) 
Is anyone aware of a driver I can install in Windows to provide full read-write access to ext3 partitions, including the journal, user rights, selinux attributes (if possible, at least preserve them) and other extended attributes? 
Have any of you actually used one of these drivers?   Currently, I share data between OSes on a dual-boot system via a FAT32 partition.   I know that I could use NTFS, which has read-write access under Linux.   However, if it is possible, I would prefer to use ext3. 

A:

Unfortunately, there is no such driver (or if there is the author(s) chose not to publish.)  All the existing drivers are of questionable quality - I have had data corruption issues with all of them.  I would stick with ntfs-3g.
Edit: Just to clarify - by "all the existing drivers" I do mean all the existing drivers.  That includes the commercial ones.  None handle all common scenarios correctly (such as proper journal replay, unclean shutdowns, etc.) 

A:

The way I solved this problem is through Ubuntu 9.04 guest in VirtualBox.  I made VirtualBox guest see the host's USB with ext3.  Then I mounted /dev/sdb2 under /media and copied all the files I needed to the folder shared between Windows host and Ubuntu guest.  A bit laborious but surely beats fighting the buggy ext3 drivers on Windows (I tried 3 of them with no success) and risking the loss of data.  In case you do nto have it already, setting up Ubuntu in VirtualBox on Windows is a piece of cake and works great both installing from scratch or just downloading an image from http://virtualbox.wordpress.com/images/ubuntu/
Hope this helps.