[fabrice67]

well, the idea is to have the possibility to put an hour on each task, like we can do it for the date. and using growl is not really a good idea. If I use such a tool (omnifocus) it is for saving time. and displaying a list of task in a project : i can not set an alarm on each task withouth using ical, which is really a heavy solution.
Really, I think that this function should be implemented in the soft.