Is My Sources.list Correct?

There are two parts to my question for my ubuntu 8.04:

1) Under 3rd Party Software, I got the following that are unchecked... Should I check to enable them?:

- http://archive.canonical.com/ubuntu hardy partner
- http://archive.canonical.com/ubuntu hardy partner (Source Code)
- Debian 'Sid' (unstable) Officially supported
- http://packages.medibuntu.org/ hardy free non free (Source Code)

These are the only ones that are checked/enabled:
- http://deb.opera.com/opera/ stable non free
- http://packages.medibuntu.org/ hardy free non free

2) Do I have the correct sources.list? Below is my sources. Please let me know!

#
# deb cdrom:[Ubuntu 8.04 _Hardy Heron_ - Release i386 (20080422.2)]/ hardy main restricted
deb-src http://archive.ubuntu.com/ubuntu/ hardy restricted main #Added by software-properties

# deb cdrom:[Ubuntu 8.04 _Hardy Heron_ - Release i386 (20080422.2)]/ hardy main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http://us.archive.ubuntu.com/ubuntu/ hardy main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ hardy restricted main multiverse universe #Added by software-properties

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ hardy-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ hardy-updates restricted main multiverse universe #Added by software-properties

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://us.archive.ubuntu.com/ubuntu/ hardy universe
deb http://us.archive.ubuntu.com/ubuntu/ hardy-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ hardy multiverse
deb http://us.archive.ubuntu.com/ubuntu/ hardy-updates multiverse

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb http://us.archive.ubuntu.com/ubuntu/ hardy-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ hardy-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository. This software is not part of Ubuntu, but is
## offered by Canonical and the respective vendors as a service to Ubuntu
## users.
# deb http://archive.canonical.com/ubuntu hardy partner
# deb-src http://archive.canonical.com/ubuntu hardy partner
# deb http://ftp.de.debian.org/debian sid main

deb http://security.ubuntu.com/ubuntu hardy-security main restricted
deb-src http://security.ubuntu.com/ubuntu hardy-security restricted main multiverse universe #Added by software-properties
deb http://security.ubuntu.com/ubuntu hardy-security universe
deb http://security.ubuntu.com/ubuntu hardy-security multiverse
deb http://deb.opera.com/opera/ stable non-free