Just wish to share a freeware developed by a teacher at Chulalongkorn University in Bangkok, Thailand.
We can use this freeware to cut 2-column PDF document and rearrange it to be easily read on small ebook reader. Please try and give feedback direct to the developer. (
somchaip@chula.ac.th )
http://www.cp.eng.chula.ac.th/~somch...2col/index.htm
Though the website is in Thai, I believe you can easily use this software without any laborious instruction. You need Java runtime version 5 up to run this software.