- Carefully preserve the integrity of the spine, delicately parting the pages just far enough to read and never far enough to cause a dreaded crack?
- Try not to crack the spine but don't care that much and sometimes wind up cracking it anyway?
- Gleefully crack the book wide open, unblemished spine be damned?
Place your vote.**
* Though when I borrow a book, I do try to respect the proclivities of the owner.
** Of course, this will all be rendered moot by the new era of tablet/e-reader/whatchyamathingies. Maybe they can provide a virtual "crack"/"don't crack" toggle option.