MyLifeOrganized (MLO) is an excellent productivity tool for implementing a number of systems for time and task management, including Getting Things Done (aka GTD; Google it or visit www.davidco.com).
MLO comes in free (lite), evaluation and professional versions. I installed the evaluation version (45 day license) and registered it (converting to pro version) by entering a license key.
This version includes a "sync to cloud" feature. With it you can sync your MLO desktop to other MLO desktops or mobile devices such as BlackBerry and (soon) iPhone.