I use Instapaper religiously (hah!). The bad thing is how it became a graveyard of oh-so-awesome-must-read articles and less a queue of stuff I do read. :) As to the "emptying your mind", all I said was that if you're focused on "emptying" you might miss what goes on to "fill" it. If your focus is on what you're filling it with, you'll automatically start "emptying" it of what shouldn't be there. :)