Unless it's animations, I see little need to use GIFs anymore. Unless it's a very high color count photo, don't use JPEG much now, either. PNG, though, I use almost daily -- especially for gradients (167byte smooth gradient backgrounds are sweet!).
For archiving photos I'd prefer using BMP, as it can be compressed better than JPEG on disk with an archiver (Stuffit is great for reducing already compressed JPEG images).
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