You can now insert the current date or time, with a single keystroke. Ctrl+D inserts the current date and Ctrl+T the time. The keys work with the text pane as well as while editing the node text.
The format of the date and time so inserted is configurable via the preferences page:
You can override the system default formats and choose custom date/time formats, so that you can have Ctrl+D insert the string "26-Apr: " for example. Here are the dialogs where you can configure this:
The codes used here are the same as those used in the "Regional and Language Options" control panel applet.
So -- do you like it? Personally, I tend use The Guide as a journal frequently, with each node representing a day's notes. The insert date feature would be quite handy in this case.