Best practices for placing images in epubs

Okay, I've read the books, I've watched the tutes and I'm still at a loss on the best way to add images to InDesign 5.5 documents that I will convert to ePub. The images are created in Photoshop at 300 dpi and sized at 800by600. And yet when I place them in InDesign and create the ePub, the images display poorly in ADE and other readers. What is the magic formula for adding images to my ePubs?
Thanks in advance
Chris

Steve/Jongware:
My thanks for your responses.
Very good point to look at the images within the epub file. They are 72 dpi images, so it would seem that InDesign is indeed lowering the resolution. I had thought I tried every variation of the available settings within InDesign to avoid this but it would seem to not be the case. If you have any specific suggestions about what setting is causing this, that would be great.
Viewing the images in the target device is of course ideal. I'm creating this for a wide range of online bookstores, so what device it will be viewed on can't be known. Since ADE drives more than 50 devices, I had hoped that would at least prove to be a reliable base of some sort -- disappointing to hear that ADE can not be trusted in that regard. I had assumed I could proof the book in that before converting to mobi and proofing on a Kindle.
Why would anyone insert 300 dpi images, you ask? In its publishing guidelines, Amazon says: "To future-proof the content, save images in 300 dpi" Is this then bad advice on their part? Elizabeth Castro echoes this recommendation in her excellent book on the subject, by the way. It's rather difficult to know just what to do, I must admit. But I guess we're still in the early days of eBook creation, with best practices still being in a state of flux.
Once again, my thanks for sharing your experience.
Chris

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