In the absence of an epub, GoodReader on the ipad is very handy for reading PDFs as books. The type is a little small on this document, but I am able to read it without zooming and panning.
What does GoodReader have over using iBooks? I've mostly just used it for storing manuals for tech products so far, but it seems like a reasonable way to read PDFs.
Mainly performance and options. Page turns, navigation, zooming are all faster. iBooks is my favorite eBook reader but GoodReader is noticeably better for reading pdfs. A mandatory app for iPad, along with Dropbox, SimpleNote and Instapaper.
Also you can crop the margins of pages so that they fit better without zooming in. It can convert pdf to text on the fly too, though of course there are formatting issues.
