I have been looking around a bit, but I didn't find a good answer.
How can I mount Linux partitions/drives (formatted with ext4) on a Mac? (I'm using Lion, so no rosetta apps will work...)
This site has you creating a linux instance on a thumb drive. I've seen other sites that recommend using vmware or for free virtualbox and setting up an instance in there. Then you can copy files by way of the VM instance