As expected, the main announcements at Steve Jobs' MacWorld keynote yesterday were an ultra-slim laptop and a new offering for iTunes users to rent movies. 

The new MacBook Air is just less than 2cm thick and fits into a standard A4 envelope – as showman Jobs demonstrated by bringing it out of an envelope to show MacWorld delegates.
Weighing in at 1,36kg and turning on the moment it's opened, Apple is claiming that the new MacBook Air is the world's thinnest computer.
The new laptop comes standard with an 80Gb hard drive, and users can upgrade with 64Gb of solid state storage as well.
The MacBook Air is base on an Intel processors which was specially designed for the product, being about 60% smaller than regular chips.
Jobs also announced that Apple has signed an agreement with all six major movie studios to offer movies to rent through the iTunes online store. The studios are 20th Century Fox, Warner Brothers, Walt Disney, Paramount, Universal and Sony.
The user interface in the MacBook has borrowed from the iPhone, with some hard drives modelled on iPod storage.