IPhoto cache full of PDD files?

I'm trying to clean up my harddisc to make more available space and to help iPhoto run faster. My iPhoto cache is full of photoshop files, a ton of them, all 4KB. Should I empty it?? I don't really understand why there are PDD files in there...

That's odd. I don't have them in my iPhoto 6 library folder. Nor do they appear in lori_diloreto's diagram of an iPhoto 5 library folder: http://homepage.mac.com/loridilo/.Public/finder.jpg
If iPhoto is running slowly, perhaps it would help to run a database rebuild. Hold Option and Command while launching iPhoto. Select all 4 options in the dialog box, and leave it to run. For more info, read: http://docs.info.apple.com/article.html?artnum=107947
If you're feeling brave you could move those .pdd files to your desktop. Then launch iPhoto and see what happens. If it's bad, close iPhoto and put them back.
Otherwise, heed PhillyPhan's PS and don't use the Finder to remove anything. It can lead to "bleeding ulcers."

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