I have a new D3000 and would like to add an additional lens. Please advise
This is such a broad question - advise would be figuring out what kind of photography you want to do. Bird watching is going to require a nice long lens, while landscape photography would use a nice wide angle lens.
Was shot with a 70-200mm f/2.8 AF-S IF-ED Nikkor lens
Was shot with a 50mm f/1.8 Nikkor lens