^^ I am sorry but am not sure if u have used it... Kindle is made to read PDF and it can be read with no issues... there is facility to change the font size to make the best out of it... please check before making such a comment that PDF ARE NOT READABLE ON KINDLE
Actually, you should check (use one first maybe?) your facts before countering a statement. There is no font resize option for PDF in kindle. The option you are looking at is ZOOM which is a pain to use. you can resize fonts in mobi and azw files. You CAN read pdf in kindle however fonts are very tiny (again it depends on the pdf itself. so far all the computer books I've read has tiny fonts at 100% zoom). It's because kindle fits entire screen on 600*800 screen and pdf ebooks are formatted for larger screen.
Good news is that you can convert any documents to kindle formatted file either using Calibre (great ebook management software) or through free Amazon document conversion service. Bad news is that, it fail to retain original format. So, if you are reading IT books, you will miss those formatted codes and syntax. Plain text are ok.
Finally, if you want pure reading experience, no gimmick, buy the Kindle. Don't listen to people who think LCD is better for reading than eink. Of course they never seen one in person.
And a picture: *picasaweb.google.com/lh/photo/ZvOZwDeAGmeviLRONhi2qg?feat=directlink