If you like life on the bleeding edge you can get the very latest development snapshot via git:
git clone git://github.com/mythryl/mythryl.git
If you do not have git installed you will have to install it. Under Debian, Ubuntu and related Linux flavors this will involve some command like:
sudo apt-get install git-core
sudo aptitude install git-core
sudo synaptic install git-core
There are a variety of git-related tools available. On Debian Linux and its derivatives like Ubuntu you can try searching for them using one or more of:
apt-cache search git
apt-cache search --names-only git
debtags search devel::rcs | grep -i git
For more information on git see the online user manual.