I just saw that BookMaster was updated and renamed to MapleRead on my iPad. Having been a MapleRead iPhone beta tester, I checked to see if MapleRead is available for the iPhone in the AppStore and it is!
If you can't see it in the AppStore, then go to the "maplepop" website (developer of MapleRead) and there is a AppStore link on their website. It's also on sale and imho, way too cheap!
Also, all versions of MapleRead have been updated with new features requested by the users including page margin controls
I love this app and think it looks great on my iPhone and iPad (and I have no conflict of interest - I have purchased both versions).