Lines appear around transparent objects!

Hello,
I think my previous post on this topic was lost somewhere in the adobe forums machine, so please excuse my repost.
I've noticed that exporting layouts from InDesign CS3 that contain transparent graphics causes the resulting PDF to show DARK LINES AROUND the transparent objects (at the transparent border). I've been using all compatibilities (1.3--1.7), and found that the lines appear on any PDF set to 1.4 or above. (1.3 doesn't have the lines, but it shows stitching lines (white lines) around the entire transparent frame box, so it's unusable.)
If I zoom in and out with the reader, I see the lines come and go, but don't want users to see a poorly rendered PDF at ANY zoom level.
How can I create a professional looking PDF without lines at the transparent borders?
thanks,
JP

Thanks for the reply. That thread was helpful in showing some of the effects that I'm seeing (e.g., turning off "image smoothing" in the Acrobat preferences helps). However, I'm still interested in producing a clean looking PDF that doesn't contain dark pixels all around the edges of the transparent images.
To show what I'm talking about, I've posted a picture of screen captures with explanations at: http://www.viveredesign.com/images/example3.jpg
This effect only appears when I export a PDF with the Compatibility set to anything above "Acrobat 4 (PDF 1.3)" (so it only looks good with the oldest item in the list).
If anyone has a suggestion on how to create a PDF without this effect, please let me know. I know I can always just put the blend in to the original image, but that seems so 1990's ;)
thanks,
JP

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