The appmenu (also known as the global menu) in Ubuntu Oneiric can be both a useful and annoying feature. When it is in action, it reduces the screen space required to render the menu bar. If you are using a computer with small screen, this is very useful for you. On the other hand, if you have a large screen, having to move your mouse to the top left corner of the screen every time you want to access the menu can be a troublesome chores.
For those who wish to remove the appmenu, simply remove the appmenu app with the following command:
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One good thing about Linux system is that you can change almost every single aspect of the system. Dislike the dull wallpaper? Change it. Not happy with the default splash screen? Change it. Getting bored of the default panel menu (the place where you access Applications, Places and System)? You can change it as well. 
For regular users of Virtualbox, you will notice that whenever you run your VM, there will be the menu bar and status bar that prevent you from running at the maximum resolution (other than seamless mode). This can be a frustrating thing, especially when you are running your VM on a netbook, where every inches of screen space are precious.
