jffs2 - journaling for flash devices is not in the kernel

There is aufs which allows for a read-only root but that doesn't solve things. For speed and reliability you need a journaling filesystem, but EXT3 will burn out the journal inode since it never moves. However jffs2 is available, but only as a module, and provides all the features (hard and symlinks, etc.) does journaling, and was designed for flash media.

For "the next" version, perhaps of the netbook remix, but it would also apply to the mainline, add jffs2 support to grub2 and to the boot kernel. (I'm not sure about ext4 - it seems overkill).