I have the kindle app on my iPad, which I use more and more. The problem is that with my "hard" books, I know which ones I've read and can just go to my shelf and look for the sticky tags with the quotes I might want to remember.
It's harder with a kindle. The temporary solution was to "share" everything to facebook. Not a good plan, since not everybody wants to know what politics and theology books I'm reading.
Secondary solution: two twitter accounts - one from my cell phone for my reading list. The other from my iPad for quotes.
I think that I'll want to take those twitter posts and somehow put them here, so that I can find them...but I'm not sure how. I love my widgets, but one of them had a virus or something, but I'll work something out. 😉