The Apple faithful are gathering in San Francisco ahead of Steve Jobs' annual keynote speech, in which he is expected to unveil new products.
Apple boss Steve Jobs has unveiled the world's thinnest laptop, called the MacBook Air.
Top of the most-wanted list, according to reports, is an ultra-slim laptop, using flash storage instead of a hard drive, and movie rentals for iTunes.
The computer, which is 0.76 inches (1.93cm) at its thickest, was unveiled at an event in San Francisco.
Last year, Apple unveiled the iPhone to great fanfare and few observers expect Mr Jobs to be able to top that launch.
The Apple boss also launched online film rentals for iTunes users in the US from almost every major film studio, including Disney and Fox.
The company is expected to sell 10 million iPhones by the end of 2008.
Mr Jobs admitted that Apple's first attempt to put online video in the living room had failed.
Steve Jobs will be hoping to build on the firm's success with the iPod and Mac line-up and to boost sales of products, such as the Apple TV, which have not performed so well.
Of the laptop, Mr Jobs said: "It's an amazing feat of engineering."
Analysts expect Apple to post record sales this year despite concerns of an overall slowdown in consumer spending.
It does not have a CD or DVD drive in order to save space.
The company outpaced the overall PC industry last year: in its last quarterly report, it sold 2.16 million Macs, up 34% from the year earlier and more than double the worldwide PC growth rate of 15.5%, according to market watchers IDC.
"It was built to be a wireless machine," he added.
The laptop will compete with a range of portable devices, from companies such as Sony, Dell and Asus, which are building so-called sub-notebooks, designed to be lighter and more mobile.
If Apple does launch a flash-based MacBook, it will follow a trend among laptop manufacturers.
Companies such as Sony, Asus, Dell and Toshiba are already offering laptops with solid state drives. More expensive than a hard drive, a solid state drive is also more reliable and more power efficient.
Last week at the Consumer Electronics Show in Las Vegas, Mooly Eden, Intel's head of global mobility, told BBC News that the move to solid state drives for all laptop manufacturers was inevitable.
Mr Eden said: "This is a revolution that must happen. They have many advantages compared to rotational drives - they consume less power, they are more reliable because you don't have moving parts."
Intel provides the processors which power Apple's desktop and laptop machines.
Streams content
The company is expected to unveil movie rentals for iTunes, which it hopes will boost its Apple TV product.
MacWorld is an annual highlight for Apple fans
The device connects to a computer and streams content from the hard disc to the box and then on to the TV, or it can store music and films using its own local storage.
Until now the device has not been able to connect to the net independently of a computer but this may change.
Apple, along with many other consumer electronics firms, is battling for a place in the digital living room.
Analysts Piper Jaffray estimate about 1.8 million Apple TV devices were sold in 2007 and expect another 2.9 million units to ship this year.
