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There is no harm in scanning at the high resolution, but if you scan film at too high res you start to scan grain which will appear like jpeg artefacts when you view at 100%. I scan all my negs and slides at 2400 ppi to ensure I don't lose detail, but pull back to 300 ppi as soon as the scan is in Photoshop and then save as a 16 bit TIFF. Ressolution for printing depends totally on the size print you want. 72 ppi is suitable enough for 6x4 and maybe 7x5 prints for instance, but not for anything larger as you will begin to see pixilation as you expand the image. 25O ppi would be fine for a 10x12 although I tend to use 300 ppi for everything, even if at times it is a bit of an overkill.
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