Good writeup and valid points. I only take issue with one statement:

    "Hey hotshot.  How about less blogging and more work on your darn company?"
    Oh, trolls.
    They used to really get to me.

Seems to me that if you take the time to write an extensive defense of blogging (and don't get me wrong - it is well written, and chock-full of valid points), that perhaps yon troll did really get to you after all...