Bottom-posting is proper Usenet Etiquette. Check out the following URL:
http://www.faqs.org/rfcs/rfc1855.html
It was that way in Fidonet, before Usenet went mainstream.
We've had this discussion in alt. food wine already. Bottom posting
is the norm. In rec. birds most bottom but not all (;-{
All the best,
Larry
Southern Ontario