There's a Kindle app for my phone (Droid) but it's so small that it would drive me nuts.

I read a lot but have very limited library time that doesn't involve small children, so I'd like to be able to purchase less expensively and more easily and not have to store books, though I tend to clear out and donate stuff periodically. I also want it for travel-fewer things to pack/carry/keep track of if I'm not carrying books.