So you hate sending the same email over and over again? Gmail's got a trick for that. Again, go to "Labs," then search for "Canned Responses" and enable it.
Now here's the semi-tricky part. Go to "Compose" and write the canned email. Then, just below the "To" line, click "Canned Responses," and go down to "Save." Click "New Canned Response," and give that email a title.
Then the next time you want to reply with that canned email, click "Canned Responses" and select the email response you want. Gmail will insert it at the top of your reply, and all you have to do is send it off.