Extensive List of Great Ubuntu Repositories

The I been to Ubuntu blog just posted a great and extensive list of excellent Ubuntu repositories.

I especially recommend medibutu: (mplayer, codecs, etc.)
deb http://packages.medibuntu.org/ intrepid free non-free
(install the medibuntu-keyring package)

Wine:
deb http://wine.budgetdedicated.com/apt intrepid main
install the key:
wget http://wine.budgetdedicated.com/apt/Scott%20Ritchie.gpg -O - | sudo apt-key add -

Opera:
deb http://deb.opera.com/opera/ stable non-free

VLC:
deb http://ppa.launchpad.net/c-korn/ubuntu intrepid main

and Google: (Picasa, Google Earth, etc.)
deb http://dl.google.com/linux/deb/ stable non-free
deb http://dl.google.com/linux/deb/ testing non-free # for beta versions like picasa 3
wget https://dl-ssl.google.com/linux/linux_signing_key.pub -O - | sudo apt-key add -

There's a great way to install the missing keys: E.g. for Opera just use this command:
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 033431536A423791
Replace the number with the one from the error message on sudo apt-get update (without the leading "0x")

Or all in one:
/etc/apt/sources.list.d/custom.list:
#medibuntu
deb http://packages.medibuntu.org/ intrepid free non-free
#wine
deb http://wine.budgetdedicated.com/apt intrepid main
#google
deb http://dl.google.com/linux/deb/ stable non-free
deb http://dl.google.com/linux/deb/ testing non-free
#opera
deb http://deb.opera.com/opera/ stable non-free
#vlc
deb http://ppa.launchpad.net/c-korn/ubuntu intrepid main

And then the keys:
wget https://dl-ssl.google.com/linux/linux_signing_key.pub -O - | sudo apt-key add -
wget http://wine.budgetdedicated.com/apt/Scott%20Ritchie.gpg -O - | sudo apt-key add -
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 033431536A423791
(...)