The best replacement for pdf is tiff.

The best alternatives to pdf are rated as following:
★★★★★  tiff
★★★★★  jpeg
★★★  epub
★★★  html
★★★  djvu
★★  ps
★★  xps
★★  word
★★  cdf
★★  doc
★  eps
★  pdf
★  pdf/a
★  jpg
★  pdf a
★  pmf
★  doc resume
★  png
★  word resume
  tif
  postscript
  searchable pdf
  pdf plus
  jpeg size
  word cover letter
  ebook
  epub better
  powerpoint
  pdf\/a
  jpeg which is better
  word document
  adobe acrobat
  pdf-x
  rtf
  word cv
  mobi
  adobe
  save as pdf
  gif
  dwf
  jpeg better
  word doc
  pdf searchable
  tiff files
  tiff size
  svg

Your alternative for pdf is not listed? Suggest!
Speaking about pdf, one probably shouldn't forget about hyperlinks.

Other search terms related to pdf and their ratings are:
★★★★★ hyperlinks
★★ adobe
★★ embedded fonts
★★ acrobat
★ printing it
★ ocr
★ margins
★ remorse
You have in mind a companion for pdf and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of pdf in all years. Click on graph for more.
pdf
tiff
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