Hi, my wife has a Kindle and I have some PDF files that I have tried converting using Calibre and Mobipocket Creator. The files convert alright but when I load them on to the Kindle the font is real tiny and cannot be adjusted. Does anyone know how to get the font larger. Thanks in advance.

If the font size can't be changed, then the PDFs are images (not text). One program worth trying is PDFRead (http://www.mobileread.com/forums/showthread.php?t=21906), which will split each page into multiple images.

Note that Amazon's email PDF conversion may do something similar to PDFRead in this case, and it is very easy to use.