A collecting point for useful tools, starting with those we use ourselves.
www.smartsheet.com [referral] – this works just like excel but tuned for projects and collaboration, we use it here at COSSD to manage our projects and make sure our tasks are spread across the year using a Gantt chart. (costs)
www.rememberthemilk.com – a nice and simple to do list manger allowing you set reminders, recurrence and allocate tasks. (free or premium)