Now you can use keyboard shortcuts on Multiply Message Board.
Install this script (click on the link above) and use the following shortcuts:
j -> Next message
k -> Previous message
J -> Next unread message
K -> Previous unread message
r -> read message
R -> read message in new tab
> -> Next page
< -> previous page
Update 2007-11-16: Added in version 0.2:
u -> toggle unread
g -> toggle groups
0 -> Mine
1 -> My Contacts
2 -> Close Network
3 -> Medium Network
4 -> Distant Network
Update 2007-11-19: Added in version 0.3:
c -> toggle custom filter menu
The 'c' key is useful only if you also have installed the Multiply Message Board Plus script.
Update 2007-11-20: Version 0.4: bug fix. Check modifiers when handling keypresses.
Update 2007-11-21: Version 0.5: Supports table view of Message Board.
Update 2007-11-28: Version 0.6: Better support for table view (page navigation keys work now.)
Update 2007-12-18: Version 0.7 and 0.8: shortcut keys for photos
n -> next page
p -> previous page
a -> album page
Update 2008-01-17: Version 0.9 and 0.10: Make album navigation keys (n, p, and a) work in new style photo albums.
Update 2008-01-22: Version 0.11: Bug fix for album navigation keys (n, p, and a) to properly work in albums with rearranged photos.
Update 2008-07-24: Version 0.12 and 0.13: more shortcut keys for photos
z -> zoom in photo
b -> go back to photo page (from zoomed in photo)
u -> go up to album page (from individual photo) -- same as 'a' key