PS2 steelbooks that I'm aware of:
- Killzone
- Mortal Kombat Armageddon (4 unique covers)
- Hitman Blood Money
- Driver Parellel Lines
- Resident Evil 4 (2 unique variants)
- Metal Gear Solid 3 Snake Eater
- Godfather
- Scarface
- 24
- Alone in the dark (also available as X360 steel wierd)
- Smackdown vs Raw 2007
- Final Fantasy XII
- Test Drive Unlimited
- Area 51
My collection thus far
Fake steels (not actually steelbooks)
-King Kong
- Splinter Cell Chaos Theory
I'm sure there are more and Mags will come and correct my list
Edit: Added Mike's corrections 