I think XGA (1024x768) is a good resolution for a 15" photo frame. Remember 15" desktop monitors back in the day (!) used to run at SVGA or XGA. Many 14"-15" laptops today still use XGA, and I don't think they really look "grainy" (though I myself would opt for a higher res on a laptop)...
Gear Digest (re Tom's Hardware) reviewed five 7" photo frames a few days ago, and most of them run at 480x234 resolution (the $200 most expensive one runs at 720x480).
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I think XGA (1024x768) is a good resolution for a 15" photo frame. Remember 15" desktop monitors back in the day (!) used to run at SVGA or XGA. Many 14"-15" laptops today still use XGA, and I don't think they really look "grainy" (though I myself would opt for a higher res on a laptop)...
Gear Digest (re Tom's Hardware) reviewed five 7" photo frames a few days ago, and most of them run at 480x234 resolution (the $200 most expensive one runs at 720x480).