Developed a few years ago as an internal project the LittleReminder site combines a surprising number of technologies. It started as an experiment with user interface drag and drop and grew to be working app in its own right.
As an experiment the reminders site was updated to provide a mobile version powered by jQuery mobile. This provides a mobile friendly way to manage reminder on the go.
It is planned to update the reminders site to object oriented design using codeigniter where the MVC paradigm allows a more. flexible approach. From there expect a mobile app to manage reminders fully while on the go, even if you are offline.