"The essential mac os x Panther server manual", although "compatible" with the iPad, is not using available resolution, instead showing the same size as an iPhone, or doubling up with poor resolution showing the same space.
I would hope that O'Reilly would be able to afford to reformat the data to fill the iPad screen reasonably well.
Help get this topic noticed by sharing it on Twitter, Facebook, or email.
Are you referring to the iPhone app version of the ebook? If so, here are some simple instructions for extracting the ePub ebook file from the app and opening it in iBooks on the iPad for a better experience -
If that's not what you are referring to, please let us know where you got that ebook.
I hope that helps,
O'Reilly Book Support