This patch adds UDF 2.50 support for kernel 2.6.25rc1 and (hopefully) up.
To apply the patch:
#cd /usr/src/linux-2.6.25rc1 (or wherever the kernel source is)
#bzcat <path_to_patch_file> | patch -p1
Please direct any comments/critiques/suggestions to manciuleas at yahoo dot com.
I've submitted the patch for inclusion into the mainline kernel, and it looks like it will make it into 2.6.26. Hopefully good news for anyone interested :).