There you, now you have a little panel on your N900 that will allow you to record your screen (and make screenshots, if you’re not comfortable with Ctrl-Shift-P):
When you press the button that I showed above and exit the statusbar menu, recording will start and you can now make videos, like this one I made. When you press the button again recording will stop. And yes, it will also record sound from the microphone, however the audio input is rather sensitive and will capture screentapping sounds and keyboard, so youmight want to mute the sound, like I did. You will find your video in your Videos folder (~/MyDocs/.videos). By pressing the camera button to the right you can take screenshots, tap it and press the camera button (on the top of your N900) to take a screenshot which will land in your images directory.
Enjoy your new screencasting experience!
Thanks to ??? for putting up the package together.