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From:
http://groups.google.com/support/bin/answer.py?answer=12348&topic=250
"Summarize what you're following up.
When you click "Reply" under "show options" to follow up an existing
article, Google Groups includes the full article in quotes, with the
cursor at the top of the article. Tempting though it is to just
start typing your message, please STOP and do two things first. Look
at the quoted text and remove parts that are irrelevant. Then, go to
the BOTTOM of the article and start typing there. Doing this makes
it much easier for your readers to get through your post. They'll
have a reminder of the relevant text before your comment, but won't
have to re-read the entire article. And if your reply appears on a
site before the original article does, they'll get the gist of what
you're talking about."
So what are you talking about?