EDIT - It's gone up to £157 now - but there's a link to buy from Wildings for £142.99 now on the right hand side where there are "more buying choices".- EDIT
It's finally dropped below £150 again (just)!
Suitable for all Nikon DX bodies.
Yes, it will work with AF on your D40/D40x/D60/D3000/D5000/D3100/D5100.
It's a very good lens, especially at the price, and the vibration reduction works well.