There's a book on itunes this one I want to buy,but I've only got an iPod 3rd generation 8gb on which the screen is too small really to read.
Is there some way I can get it onto a pc to view properly?

i use Calibre to read on pc , exchange files to my iphone and on my kindle .. its a reader , converter ect . as far as i know its free to download.
http://calibre-ebook.com/download

hope its ok to put link

I've now bought it and it shows up in the itunes store and also on my pc but I can't open either to read it.
In calibre comes up about DRM (DIGITAL RIGHTS MANAGEMENT?)
Any other readers that may open it on pc?

There is an addon for firefox that allows you to read Ibooks. Its called Epub reader or something. I use it all the time.