~/.bashrc and put this at the end:
alias boil='git clone git://github.com/paulirish/html5-boilerplate.git'
or alternatively, this
git clone git://github.com/paulirish/html5-boilerplate.git
From now on, in every new terminal you can use the command
boil as an alternative to your long command.
The second version is to prefer, because is more flexible being able to accept and manage parameter, for example if you define
[[ -z "$1" ]] && set "github.com"
git clone git://"$1"/paulirish/html5-boilerplate.git
you can easily change server, if there are mirror.
# without a parameter, the function will use a default
# override the default providing explicitly a server parameter
It is only an example, your fantasy surely will generate something more useful.
Obviously you can add as many functions as you need.