Here's a short list I compiled from some folks I've talked to.
The Art of the Start by Guy Kawasaki
Founders at Work by Jessica Livingston
The Four Steps to the Epiphany by Steve Blank
Getting Real by the guys from 37 signals (agile development for the non-technical)
The Lean Startup by Eric Ries (ok, it won't be published until Sept 2011)
I'm I missing any good ones?
If you haven't done this before, then I would recommend:
Also see the Books tag.
The Tipping Point, Outliers, by malcolm gladwell. Watch mixergy, this week in venture capital, this week in startup. But at the end of the day, start your startup, don't get caught in the trap of thinking your accomplishing or "learning" just by reading a crap or watching a lot of business related videos, the best way to learn is to actually start your startup.
Rework from 37 Signals and Poke the Box Workbook by Seth Godin (free download)
I'll summarise it for you - Go Do. Seriously you'll learn far more once you've started rolling than you ever will reading about it. If you believe your idea will fly, get on and fly it :)
"Rework" also by the guys from 37signals (more about the business you must be in, even while developing)
"Getting Things Done" and "Making It all Work" by David Allen (because you are going to have a lot to do)
And Saad is right, you can only prepare for so long. Go, do.
I'd add the New Rules of Marketing and PR by Robert Meerman Scott. We used this and it helped us shape a realistic launch plan with appropriate and effective use of social media, press, news releases, etc. for our start up.
A couple come to mind: