This is a good news, bad news story. Let's start with the good news!
DisplaySearch, a market research firm, is reporting that Apple's sales of notebook computers are up 61% from 1st Quarter, 2007 to 1st Quarter, 2008. In that fiscal quarter, Apple shipped over 1.4 million notebooks, compared to almost 900,000 the year before. That puts Apple just behind Asus in terms of growth year-to-year, as the Taiwanese board and component maker saw a 67% growth rate. Most other notebook manufacturers saw growth rates in the 20 - 40% range.
The bad news? Apple's still in seventh place in overall notebook market share at 4.6%, trailing behind leaders HP (20.8%), Dell (15.1%), and Acer (14.7%) but still ahead of Asus (4.3%) and Sony (4.2%).
My personal speculation is that Asus is seeing huge increases due to the Eee PC subnotebook, which has been extremely popular with geeks wanting tiny Linux or Windows computers. If trends continue, Apple's notebook market share numbers should continue to grow into 2008.