Tip for Android users afflicted by Backspace/Submit key proximity
Try out Hacker's Keyboard.
Even on a 7" tablet, the default keyboard would give me problems. I would routinely hit the Enter/Submit key by accident while holding Backspace (in the process of revising). I'd lose a heart and die a little inside.
With the custom keyboard though, the two are separated by the backslash ('\') key. It's nice to be able to scale up the input window too, but YMMV on smaller devices.