Trying to get my stash organized (it's a never-ending task...) and I'm curious about templates.

I use GIMP & I *have* CS5 although I have barely began trying to figure it out. I can use .psd files in GIMP for templates.

So.... is there any point in keeping .tiff or .png of templates? I get rid of the .page ones automatically because I can't even use those. I keep debating on getting rid of the tiff & png though. Deleting them would save a bunch of space... but will I want them for something in the future?

So what do you do and what should I do? Is there a point to keeping more than the psd?