This program display similar things (like music, movies, TV shows, books and author) if you use it without options, display descriptions if you use -d option, and transalate them to your language with -l option. Check -h options for more info.

You need xgoogle library to it to work, you can download it from 
http://www.catonmat.net/download/xgoogle.zip

if you want to download all youtube files (on GNU/linux) use youtube-dl

on Debian/Ubuntu

apt-get instll youtube-dl

or

wget http://www.nuxified.org/system/files/youtube-install.sh
sudo ./youtube-install.sh

and then run the script:

for i in `similar.py -y $1 | grep http`; do
    youtube-dl $i
done