OS X Mountain Lion ships with two new apps, Reminders and Notes, which are basically OS X counterparts of the standard iOS apps with the same names. One nice thing about these new apps is that they are scriptable.
This means that I was able to create two simple AppleScripts and thus an Alfred extensions to make a new reminder in the default list and to make a new note in the default folder.
You can view the sources of the AppleScripts below.