The team that made ICO and Shadow Of The Colossus (Sony Computer Entertainment Japan) use LW only.
Here is SotC interview in Japanese:
(to find translations just google for The Making Of "Shadow Of The Colossus")
Several years ago they made a very interesting presentation at GDC, including some info on how ICO prototype was completely created in LW by a single person etc. Unfortunately I can't find those slides online anymore.
I guess whatever PS3 project they're currently working on, they still use LW as their main/only tool.