Suggested reads for a startup... given we have oh so much time to read?

I love learning. I love reading great, interesting pieces. However, I'm also juggling time so that I can work on my startup and wrapping up b-school.

There are some great blogs and other articles out there including posts here to HN, PG's essays, LinkedIn, etc. I also know there are great lengthier reads (books).

What books would be good to read that also don't need me to devote boatloads of precious hours to fully appreciate them (learn from)? Unless there are none...