The release focused primarily on fixes and cleanups. A bunch of minor bugs were fixed, and I rewrote most of the iCalendar back-end. It should be faster now and preserves files better than it used to.
This release includes a dummy maemo interface. It can currently fully display a Day Planner calendar, and has a UI quite similar to the desktop edition. However, it can not edit or add any events, and is as such not as useful as it might have been. The plan is for the maemo port to be ready for 0.11.
0.10 will (among other things) feature a new HTML exporting module (which has been in the works for quite a while), a cleaner, object-oriented version of the add/edit event windows (to simplify their use and maintainance. The current code that handles it is a bit ugly).
The major user-facing change will be the addition of a GUI for calendar subscriptions. 0.9 includes support for them (though it isn’t really announced because the feature isn’t ready), but one has to manually edit the config file.