[asb]

Have you tried k2pdfopt? I've found it does a fantastic job.

[MasterScrat]

Ooh that is interesting.

Someone should make an online converter: you email your paper to the converter address, it optimizes it and sends it to your Kindle.

[kanakiyajay]

Have you tried emailing your pdf as attachment to your free kindle address with subject "convert". This works for me everytime.