Beware of running 'Log in History List' actions in loops (for each, loop, etc.). Not doing this will clutter the workflow database with logs and impact customers. If you have them, set them to "Hide from workflow status" in the "Common" tab of the for each or loop. In general, there shouldn't be too much logging in your workflows anyway. Its better to use those for troubleshooting and giving general information to the user.
Lisa