Do you have an Android phone? Did you know that there is now a free Kindle app for Android phones? (Apparently they also have one for iPhones? But Apple is...not my favorite company. Although I do really appreciate Steve Jobs' stance on his products being porn-free.) But I digress.
Kindle on your phone is great! Cheapskate that I am, I downloaded several public domain books. It's kind of weird to turn the page nonstop (and that being on page 1159 puts me only a quarter of the way through a book), but it's definitely handy to have a book with me wherever I go, no matter how small my purse is.