I did the Urban Organics delivery last year while I was in school. I loved it - they give you a nice selection in ample quantities, and you can permanently exclude certain items you don't like.
The recipes they give you are great, too.
Only problem is that they're not flexible when it comes to delivery hours. If you're not there during the determined period, you're screwed.
I know there's a few of these types of services around but you may want to check out the Home Cooking Board and OB board 'cause there's been recent threads on someone in Brooklyn who gets similar weekly vegetable deliveries.