If you are on Ubuntu or a similar Unix you will already have these, but double check you have the following command line utilities available to you for the fetch.sh script to run: curl, gunzip, head, perl, python, sort.
Next put fetch.sh in your crontab:
30 * * * * cd /home/ed/Projects/wikitrends/; ./fetch.sh
Then make your wikitrends directory web accessible. For example w/ Apache first symlink your document directory to your git project directory:
ln -s /home/ed/Projects/wikitrends /var/www/inkdroid.org/wikitrends
And then modify your Apache configuration allowing it to access the directory:
<Directory /var/www/inkdroid.org/wikitrends> Order allow,deny Allow from all Deny from none Options FollowSymLinks Options +Indexes </Directory>