Newbie question: which dn is recommended

[Bennett Samowich <brs@ben-tech.com>]

Greetings,

I'm not sure that I understand the hierarchy of LDAP yet.  Which dn is "recommended" under a business application:

a) dc=<MY-DOMAIN>, dc=<COM>
  - or -
b) o=<MY-ORGANIZATION>, c=<COUNTRY>

What is the difference? or why would one be used over the other?

Side question: any recommended books on implementing a LDAP directory?  (this way I won't have to bother the list with newbie questions)

Thanks in advance
- Bennett