One my favorite quotes that I always think of was from a behind the scenes interview about level design for the game Splinter Cell. The designers were talking about early on how things work. So, if opening a door is one way; it has to remain that way throughout the game.

Whatever you decide upon (and certain KISS is the best), just remain consistant. Going to different pages should never result in unepxtec navigation behavior or placement.

And like Joel Spolsky says in User INterface Design For Programmers; you're kind of stuck with the expected UI. Which is why every word processing program looks pretty much like Word. It kinf of sucks from a design perspective, but you just can't do something totally out of the blue. Not that it wouldn't be really cool, it's just that people will reject it.

Good luck!!