By the way cs3.
Please post the PDF somewhere for us to see. A screenshot is fairly meaningless in this case.
I remeber seeing this before, but at the moment I don't recall the cause. If you change the font does it still happen?
Pixelated images sounds like either too much downsampling or missing/modified links.
Wow - thank you for all the responses. Yes it still happened with different fonts, different sizes of font etc... So I looked at my export settings and noticed that it was set to High Quality Print - Modified. I Switched it back to High Quality Print and it appear to have cleaned it up quite a bit.
Thank you all for your speedy responses.
What was the modification? Was there transparency on the pages, perhaps, that was being flattened? I wouldn't be surprised if the wrong flattener settings caused some issues like that.