Top-posting, bottom-posting or inline comments, whatever one you chose will be fine as long as you trim the quotes. All of the problems people have with one style or another stem from lack of trimming. All of the people who have commented on this thread seem to agree on one thing only: trim your quotes.
I've added this to the EmailFAQ http://clug.net.nz/index.php/EmailListFAQ
(and tidied up the formatting, added a table of contents, etc.)
-jim
