After Installing ADT Plugin, Welcome to Android Development Doesnt Appear

Try this
Window > Customize Perspective > Menu Visibility > Expand 'File' > Expand 'New' > Tick 'Android Project'
and Then, look for new Android application project

I've had the same problem on eclipse juno.

No "Welcome page" appeared, I could not create a project, compilation didn't work and "Graphical layout" didn't work.

It have been fixed by: Window > preferences > general > startup and shutdown: check "Android development toolkit"

Reestart eclipse.

Of course you have to be configured this: Window - Preferences - Android - SDK Location and setup SDK path.