I've just updated my "Remember The Milk"-talking lisp library. Now you can access their API with a simple CLOS-based object model.
You can fetch the latest version by direct download, SVN and/or by asdf-install from the project page, where I have the important updates:
* Added an object bridge to make the API even more integrated with the language.
* Methods and functions were coded to be easier to manage a local state of the RTM user data.
* Improve synchronization and bandwidth usage by fetching only recently updated data;
* Provide offline work for the local data