I've been reading this site for some time and I've found a solution for expanding pdf's by "tiling". This allows one page to be expanded to two or more pages making a zoomed in version of a pdf.
This can be done with MindCad Tiler:
http://mac.softpedia.com/progDownloa...load-9560.html
http://www.mindcad.com/tiler.html
which is only for mac (sry)
or
Adobe Acrobat Professional
-in Tiler open your pdf, set page setup to print in landscape mode (on side) and save as pdf. You will need to repeat this for every page...
-in Adobe, select print; in the options screen that opens set page scaling to "tile all pages" then set zoom to 180% (fits one page onto two pages nicely) and then in output options select "save as file" pdf with pdf formatting
Both of these options produce neatly cut pages but the text recognition is damaged in some, not all, programs. Sometimes text can be cropped a bit but the remaining text looks fine.
I haven't tried this on a ebook reader yet as I am still undecided but this pdf size problem shouldn't be too bad of a turn off if you are into reading articles where pdf formatting is important.