Photostream/Photo import duplicates If I use photo stream and later plug my iPhone into the computer. Will I end up with a bunch of duplicates? Or will it import from my phone only any photos that weren't previously uploaded, for whatever reason, via photo stream?
No duplicates will be uploaded to Photo Stream—only media that didn't get uploaded will be uploaded. This general rule also applies to photos transferred to other devices; the other device won't upload duplicates either.