Just wanted people to know that my brother-in-law, the Kindle aficionado, recommended a utility k2pdfopt.exe
http://www.willus.com/k2pdfopt/ allows you to convert PDF files to read on your Kindle.
The utility will allow you to convert pages, ignore whitespace, clip graphics into separate pages, etc.
I have not used any of the optional settings on the utility. I merely dragged and dropped a datasheet onto the utility, selected NO options and (as magicians say) poof, bang, voila I get a perfectly readable datasheet on my Kindle.
A 48 page PDF from Microchip took about 2 minutes to convert on my 3 year old laptop. The new file is 7 times larger than the original PDF (5 Mb after conversion).
I will try some of the options and let you know if I can get the file size down.
Enjoy