First divide by fiction, non-fiction, and reference materials. For fiction, subdivide by series and arranged by publication order. For non-fiction, arranged by Dewey Decimal. For reference materials, arranged by subject area. When all things fail (which always does), stack them to oblivion.

Planning to watch TNG 2.04 (The Outrageous Okona) first before going back to read the latest TNG novel (Collateral Damage) because Okona.