Small suggestion to raspbian developers:
Because pi uses flash sd card as storage device, maybe it's good idea to use f2fs for base system, instead of ext4? How do you think? It's already available in debian: http://packages.debian.org/sid/f2fs-toolsF2FS is a new filesystem for Linux aimed at NAND flash memory-based storage devices, such as SSD, eMMC, and SD cards. It is based on Log-structured File System (LFS).
I'm not sure if ext4 is good choice, I think even ext2 will be better.