I had the same kind of reservations, but now I think that’s the wrong way to look at it. You could put stuff out in the public sphere without any pretensions of greatness.
Apart from one-lines, Twitter is also used for sharing links, etc. In some ways I prefer it to sending email out to a group, since the group has to be selected by me (presumptuous) whereas following my tweets is a decision made by the injured party :-).
—ravi