Improving ext4: bigalloc, inline data, and metadata checksums

I agree that both jfs and disk based RW udf are way underrated. I use jfs on our laptop as it supposedly tends to have less cpu usage, and thus is better for reducing power usage. UDF, if properly supported by the kernel, would make a fantastic fs for accessing data in dual boot situations as Windows has pretty good support and it doesn't have the limitations of vfat nor does it require a nasty, awful, performance sucking hack like ntfs-3g.