I think the e-reader evolution has just reached a tipping point. In fact it's may just be my personal tipping point, since the release of the new Kindle 2 has generated a significant amount of gadget lust in me. Every night at bedtime, I am faced with the 3 or 4 reading choices living on my night stand. The idea of having an entire collection of books, magazines, blogs, and personal documents at my disposal holds a great deal of appeal. By all accounts, the screen size of the Kindle and it's main competitor, the Sony 505, are plenty big for your average novel or plain text document. At $300 - $400, that still makes them a pretty steep gadget investment. The really drool-inducing gadget in this up-and-coming technology is…