As I'm sure you remember one of the approved GSoC 2010 projects was the implementation of Ext3 support. Work of course is ongoing and a couple of days ago Janito (aka jvff) posted his latest update, about journal implementation. In it he mentions right at the start that the "fundamental parts" are completed, ready to support the first steps into having write support for ext2/ext3 volumes.
It's a long (but interesting) post and you should definitely head over and take a look. Good job Janito.