A record question

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when i set up a zone file, I usually use A records for most of the DNS
names; is this ok to do?

i.e:


domain.com.	IN  A	1.2.3.4
www		IN  A	1.2.3.4
ftp		IN  A	1.2.3.4

is it okay to give the same machine multiple A records, or should I
use CNAME RRs? I've been hearing some bad stuff about CNAME usage, and
it's apparently not possible to use multiple CNAMES in BIND 9.x.

i appreciate the input