Ouch!

Have you done ANYTHING to md0 or the underlying devices since then??

I believe that md0 uses an on-disk block for tracking meta information, but that essentially, the underlying partitions are simply kept in sync as normal filesystems are. Translation: you can directly mount the underlying file system. If they're not too out-of-sync, you can just fsck and mount. If the fsck fails at first because the md0 blasted it (unlikely), you can just use a backup superblock and specify that to fsck.