What do you want to use the photos for? A lot of photographers will go for pictures that are as uncompressed as possible, often even eschewing the JPEG format for something that doesn't lose information every time you save it. After all, storage is pretty cheap.
Personally, I find that saving at about 80-85% quality looks fine, even zoomed in. Once a photo is prepared I don't typically come back and edit it again, so the resaving loss is not a big factor. A finished file will typically be no more than a couple of MB and often smaller (drastically so if it has been cropped down to a smaller size). My main target is publishing on the web, where large images are not required, which is why YMMV.
Wulf
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Wulf Forrester-Barker << Sites: blog / flickr >>
Gear: Nikon D40, Nikon AFS 18-55mm f/3.5 - 5.6G, Nikon Series E 50mm f/1.8, Nikon AF 70-300mm f/4-5.6G, Vivitar 90mm f/2.5 macro, Raynox DCR-250, Lensbaby 2.0k, SB600
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