If you have not tried out Evernote yet - give it a whirl. It's an amazing app. I do all my writing in it these days but I also use it as a thinking tool to capture and pull my fragmentary thoughts together.
It synchronises my notes and articles between my laptop, iPad and iPhone.
I do serious writing on my laptop.
I tend to proof read and reflect on my iPad and while waiting for my wife at the station or travelling into London on the train I use my iPhone for both reading and minor editing.
I just love to able to read, write and edit like this any time, any place.
And I can work off-line and it syncs via the web later when I'm connected to the Internet.
I love the ability to create different notebooks - a bit like categories and its great also to be able to tag items.
But what I think is the coolest feature of all is the Evernote Web Clipper.
This allows me to capture webpages straight into Evernote. There are various options but if I capture a page as a "simplified article" - its strips out all the ads, all the menus, all the side bars - pretty much all the junk and leaves me with nice clean text.
I tend to use it mainly to capture a blog post or an article. In this way as I read through the item later I can strike through the paragraphs that I feel are junk and highlight the good stuff.
Then a few weeks later when I come to read it again I can focus my reading on the critical text.
Oh and I can mail stuff into the database too - so I also use it to capture ideas and fragmentary thoughts that I can dwell on and pull together later.
Take a look, it has many more features I have not mentioned, I think you will love it.