You’ve recently upgraded to Ubuntu Natty and discovered that Unity is crap. Don’t worry – you’re in the vast majority. One of the many issues with this disastrous attempt at a shell is that it moves application menus into a global menu in the top panel. This may be useful for small screens – but for the other 99% of the market it’s just downright frustrating.
After a bit of searching I came across this post describing how to banish the global menu back to the warped hell from whence it came. You want to remove the indicator-appmenu package.
This is but one of a great many great challenges you’ll face if you decide to continue on with Unity. Good luck…and may God have mercy on your soul should you choose to stick with it.