I use S-Memo a lot. I use it to take notes at meetings, to draw up ideas, and to jot down things I need to remember. Once a week or so, I review them all and move them to permanent storage -- Evernote for reference, and Remember the Milk for tasks.
I occasionally use the Samsung Clipboard -- it's handy for moving clip art from screenshots and so forth. But I keep my frequently-used text snippets in Clipboard++.
I don't use Google Docs much, though I'm interested in its collaboration features.