If you're on an iPhone and taking a lot of pics that can (but don't necessarily HAVE TO) be resized to 640x480, I use an app called Image Size. You take the photos in the app and transfer them to your camera roll as you go. Once you set the resolution it's always the same. It's super fast to use and the transfer time (especially if you're not on wifi) is a fraction of what it is if you use the regular app.
It makes uploading to any app, including Mobi, much faster.
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Seriously, nobody cares that you're offended.