Don,
He needs delay, in case, If he clear the lcd too fast...
Well, as I said before, he doesn't need the clear instruction, at least not where it is right now.
The LiquidCrystal library has accounted for the fact that the clear (and the home) instructions take longer to execute than the other instructions.
An extra delay won't hurt however and it could help if you are using a low cost possibly out of spec display. You probably won't ever notice the extra delay either.
Don