Is there a good, free (as in FOSS) program that will allow me to access 
some Linux filesystems (especially ext3 or ext4) from Windows?  I would 
just need read-only functionality.  I really don't like using NTFS with 
Linux, so I'll want to use ext3 or ext4, probably, on external devices 
with Linux, but sometimes I'll want to access those files from Windows. 
It would be especially great if the program could run from a flash drive.

Have any recommendations?

Mike