Hi
I was looking at the 2D/3D viewport and I found it quite confusing why viewport switch was greyed out ? - it's implies that this icon/button can't be used in the current setting.
So I decided to see if I couldn't make it a bit more obvious what the purpose of the icon/button is for - please have a look:
I think it is obvious that this button is a switch and it is used for switching between the 2D and 3D viewport.
I also took the liberty to move the link to the manual, bug reporting, link to the forum and the exit buttons to the top of the toolbar, so they are always accessible and thereby easier to find for the users.
I hope the majority of you like these small suggestions for improving the User eXperience and that the developers can agree as well.