Missing IPhoto App

After upgrading from Tiger to Leopard on my MacBook Pro a few months ago, I recently discovered that my IPhoto application is missing! I had not been having any problems with it until now. I have thousands of photos which are still stored in IPhoto Library, thankfully. I ran into this problem with my old G4 a few years ago and lost all photos.

Will reinstalling Leopard restore IPhoto, and what, if any, effect will this have on my stored photos?

Reinstalling Leopard will not remove your photos as Leopard by default does an Archive and Install reinstallation. However, since Murphy's Law likes to lurk about, it would be a very good idea to back your iPhoto Library up first. You can back it up to an external hard drive or flash drive.

Thanks for the info. I think that a flash drive backup is a very good idea.