Just want to say - thanks a ton for this howto, I've been looking for a way to do this for a couple days. Works great, though I set mine to work only every 30 minutes. (Only 10 wallpapers so far. :)

Anyway, instead of the whole cron.txt thing, simply use "crontab -e", as this will open your cron file if you have one already or make a new one if you don't. Just eliminating one step.