I'm having issues rasterizing images for inclusion in PDFs. I currently rasterize in Illustrator, import to InDesign, and downsample from roughly 300 ppi to 150 ppi, or thereabouts. I would prefer to rasterize to 150 ppi in InDesign instead but that doesn't seem to be possible. The resulting images are always "crunchy" regardless of the Illustrator output resolution. I've tried going as high as 600 with PNGs. The images look okay coming out of Illustrator.
Also, when I then view these PDFs in Acrobat, there are often small image errors that only appear at certain zoom levels.