This issue keeps cropping up, with people suggesting/pushing for the inclusion of some file system or another. First and foremost, all I have to say is, stop worrying about this. NTFS is on the roadmap, ext2 is being worked on (I think) and by extension that'll eventually evolve to ext4. It will get there when it gets there. So people who are pushing for those two, stop worrying.
For people who are pushing other file systems, you need to realize something here. The kernel is extremely incomplete. Even if we had a fully functional FS driver, there's no guarantee it would work. We have a FAT32 driver because we need something in order to write things on, and FAT32 is probably one of the simpler file systems. The ext2 driver is because one of the devs or someone was interested enough to create it.
Right now, the devs are focusing on getting things to work and stabilizing them at the OS level. If you want a driver for this or that FS, you'll have to write it yourself. The developers just do not have the resources to fulfill FS requests. Suggesting a FS won't really do anything for that reason.
Edit: People keep pointing to NTFS-3G and keep pestering us about it. First of all, this is a Linux driver. Second of all, this is a user space driver. Third of all, it's still relatively incomplete. It's got the basics done, but none of the tricky stuff. Those three factors means right now it's useless to us. At best, it would serve as a reference for when we do work on our own NTFS driver. At worst, it's useless to us.
