I've organized my bookshelf by the importance of the book to me. The years in parantheses are when I read the book.

My pile

What I'm currently reading.

So good it hurts

Books that gave me that feeling of regret that I'll never be able to read them for the first time again. I'd suggest these even if you have no interest in the subject.

I love this book

So good it hurts for me, but I'm not sure it will for you.

This book has stuck with me

Books that have had a major impact on how I think about the world. The quality of writing in this category is less important than the impact of the ideas on my life.

Really freaking good.

Great writing, just not quite so good it hurts.

Honorable mentions

Almost but not quite.