Hi Daan, If your trying to run a job that will need to be run from time to time manually, then you should write a rake task and put it in your lib/tasks/ directory. If your trying to run something automated then you need to look at BackgroundRB [1] or RailsCron[2]. Note that RailsCron is no longer supported, but I still like it better than BackgroundRB.
Good Luck, Rob Kaufman
[1] http://backgroundrb.rubyforge.org/ [2] http://svn.kylemaxwell.com/not_supported/rails_cron/trunk/README
