I don't know why I remember, but there are really expensive centrifugal smoothie-makers that seperate out skin and pips etc from pulp.
Has anyone heard of Innocent smoothies? They're quite the company. They make A1 smoothies, they have funny little things on the bottles (that I've seen other companies try and emulate and come across as less sincere), and it used to say on the bottle "made from 80% recycled plastic - we're working on the rest". then they actually became the first company to develop a way of using 100% recycled plastic in their packaging, alongside a recycled paper label.
And at winter, the bottles come with individually hand-knitted hats, donated by fans, and they donate 50p per bottle to looking after old folk during the winter.
Great company, I can't believe they sold half themselves to Coco-cola.