Proper implamentation of A and CNAME records

[Jonathan de Boyne Pollard]

ES> We want this site to be at both www.domain.com and domain.com.

What a surprise!  (-:

<URL:http://homepages.tesco.net./~J.deBoynePollard/FGA/web-allowing-omission-of-www.html>

One of these days, web browsers will use "SRV" resource records, and 
this extra "www." label business will go away.

ES> I also know it's not proper (though this is what most site
ES> do like M$, Sun, etc.) is to create two A records for the
ES> same IP, one pointing to www.domain.com and domain.com.

Rubbish.  How do you "know" this?  It's entirely proper to have two "A" 
resource record sets, one for each of the domain names.