I include frequent asides when I'm blogging or e-mailing and have become aware that it's a sloppy habit. So now when I proof I ask myself questions like "Could that be stated as a separate thought?" and "Does it need to be said at all?" and "Does it interfere with the primary sentence?" I don't know when this habit began, but it's a hard one to break.
(Really hard) :)
Next I will give up smilies . . . And ellipses . . .