For some reason the new N800 image didn't include the new apps like the FM radio or the other two.
But they are all in the Nokia standard repository, which should already be in your program catalogue. If you go to the application manager, tools, update appliction list (or program list, I'm not sure -- I'm not in the English locale so my version says something else), then look in the list of installable applications and you should find camera and mnotify there (and the fm radio too).