Wow. If you're not using "Remember the Milk," you're missing out. Put that with Google Calendar. Add both to a Blackberry Curve, and pow, bam, hooray. But seriously, our staff and interns at Karis are using RTM, and it's really helpful in getting things done. It's all online and makes it easy to manage tasks. I have it sync with my Blackberry tasks, and it works perfectly.