It worked! For the record, my rebuild-tree output is below. It looks like that reiserfs was sick, sick, sick.
Thank you very much for your cautious, reasoned and calm responses.
Everything ended up in lost+found, but I could retrieve the one critical file, namely
/mnt/gentoo/raid/lost+found/2_5369/lib/zope/zope-pendrums/var/Data.fs
cdimage root # reiserfsck --rebuild-tree /dev/md0
<-------------reiserfsck, 2003-------------> reiserfsprogs 3.6.8
[...] Will rebuild the filesystem (/dev/md0) tree Will put log info to 'stdout'
Do you want to run this program?[N/Yes] (note need to type Yes if you do):Yes Replaying journal.. 0 transactions replayed ########### reiserfsck --rebuild-tree started at Tue Jan 20 12:44:02 2004 ###########
Pass 0:
####### Pass 0 #######
Loading on-disk bitmap .. ok, 647544 blocks marked used
Skipping 8790 blocks (super block, journal, bitmaps) 638754 blocks will be read
0%....20%....40%....60%....80%....100% left 0, 22026 /sec
193779 directory entries were hashed with "r5" hash.
"r5" hash is selected
Flushing..finished
Read blocks (but not data blocks) 638754
Leaves among those 38854
Objectids found 8553Pass 1 (will try to insert 38854 leaves):
####### Pass 1 #######
Looking for allocable blocks .. finished
0%....20%....40%....60%....80%....100% left 0, 3532 /sec
Flushing..finished
38854 leaves read
38778 inserted
- pointers in indirect items pointing to metadata 3 (zeroed)
76 not inserted
####### Pass 2 #######
Pass 2:
0%....20%....40%....60%....80%....100% left 0, 0 /sec
Flushing..finished
Leaves inserted item by item 76
Pass 3 (semantic):
####### Pass 3 #########
Flushing..finished
Files found: 0
Directories found: 2
Pass 3a (looking for lost dir/files):
####### Pass 3a (lost+found pass) #########
Looking for lost directories:
/2_4vpf-10680: The directory [2 4] has the wrong block count in the StatData (1) - corrected to (2)
vpf-10650: The directory [2 4] has the wrong size in the StatData (48) - corrected to (752)
/2_113get_next_directory_item: The entry ".." of the directory [2 113] pointes to [1 2], instead of [2 258218] - corrected
/2_5022get_next_directory_item: The entry ".." of the directory [2 5022] pointes to [1 2], instead of [2 258218] - corrected
/2_5212get_next_directory_item: The entry ".." of the directory [2 5212] pointes to [1 2], instead of [2 258218] - corrected
/2_5360get_next_directory_item: The entry ".." of the directory [2 5360] pointes to [1 2], instead of [2 258218] - corrected
/2_5365get_next_directory_item: The entry ".." of the directory [2 5365] pointes to [1 2], instead of [2 258218] - corrected
/2_5367get_next_directory_item: The entry ".." of the directory [2 5367] pointes to [1 2], instead of [2 258218] - corrected
/2_5369get_next_directory_item: The entry ".." of the directory [2 5369] pointes to [1 2], instead of [2 258218] - corrected
/2_5369/log/wtmpvpf-10680: The file [7261 7264] has the wrong block count in the StatData (1152) - corrected to (1128)
/2_7587get_next_directory_item: The entry ".." of the directory [2 7587] pointes to [1 2], instead of [2 258218] - corrected
/2_26686get_next_directory_item: The entry ".." of the directory [2 26686] pointes to [1 2], instead of [2 258218] - corrected
/2_26689get_next_directory_item: The entry ".." of the directory [2 26689] pointes to [1 2], instead of [2 258218] - corrected
/2_26784get_next_directory_item: The entry ".." of the directory [2 26784] pointes to [1 2], instead of [2 258218] - corrected
Looking for lost files:
The object [141767 141772] has wrong mode (b--xr--r-x) - corrected to -rw-------
vpf-10670: The file [141767 141772] has the wrong size in the StatData (0) - corrected to (1912)
vpf-10680: The file [141767 141772] has the wrong block count in the StatData (0) - corrected to (8)
The object [141778 141818] has wrong mode (?---------) - corrected to -rw-------
vpf-10670: The file [141778 141818] has the wrong size in the StatData (0) - corrected to (1640)
vpf-10680: The file [141778 141818] has the wrong block count in the StatData (0) - corrected to (8)
The object [141836 141840] has wrong mode (?---------) - corrected to -rw-------
Flushing..finished
Objects without names 19557
Empty lost dirs removed 166439
Dirs linked to /lost+found: 12
Dirs without stat data found 1
Files linked to /lost+found 1975
Objects having used objectids: 4887
dirs fixed 2
Pass 4 - finished done 0, 0 /sec
Deleted unreachable items 6
Flushing..finished
Syncing..finished
###########
reiserfsck finished at Tue Jan 20 12:46:00 2004
###########
cdimage root # mount -r -t reiserfs /dev/md0 /mnt/gentoo/raid/
cdimage root # ls /mnt/gentoo/raid/
lost+found
-- Jean Jordaan http://www.upfrontsystems.co.za
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