I found this recent article from Horace Dediu of Asymco to be particularly 
jaw-dropping.  Just check out the graph on this web page!

http://www.asymco.com/2011/04/14/first-quarter-pc-forecast-windows-down-2-macipad-up-250/

As a long term Mac enthusiast who slogged on through the dark 90s, I find 
myself shaking my head in awe more and more these days as Apple does the 
impossible quarter after quarter.

-Mart

-------------------

Excerpt:

First quarter PC forecast: Windows down 2%, Mac+iPad up 250%

Horace Dediu

"But the most telling line is the orange line which includes both the Mac and 
the iPad. In an industry where growth is usually measured in single digits, the 
iPad business brings growth in three digits.

This near tripling of unit sales is symptomatic of fundamental change that 
cannot be ignored. Although some analysts contend that the iPad is not causal 
to the decline in other PC sales, teasing out platforms data seems to show a 
divergent view.

The bottom line is that Windows-only computer units are down 2.0% while 
OSX-based computer units are up 272% (this excludes both the iPhone and iPod 
touch).

Correlation is not causation but tests or surveys where substitution can be 
proven do exist. For example, a recentsurvey shows that 77% of users reported 
that their PC usage decreased after getting a tablet. It also showed that 28% 
considered their iPad as their primary computer.

So coupling the sales data with the usage data does point an accusatory finger 
for the decline on the iPad.

In addition, some vendors are being hit harder than others which also hints at 
where substitution is happening. For example, IDC reports that Acer US unit 
shipments fell 42% in the first quarter and 16% globally (Gartner’s numbers are 
less dramatic but in the same direction). Since Acer is known for its netbook 
computers it’s another telling sign of possible substitution (Acer’s own 
management has indicated as much.)

So the weight of evidence is beginning to be conclusive: the iPad is the new 
PC. It should be clear by now that the iPad moves computing into new contexts 
so it does not yet substitute the PC market but extends it and increases 
consumption. Substitution is happening in low-end grazing type of usage, a 
place where the PC was ill-fitting anyway. Incumbent vendors might actually be 
relieved that the lower margin netbook is finally being supplanted and they can 
concentrate on the higher end.

Notes:  Analysts like to call the iPad a “media tablet” but the same AdMob 
surveyshows media consumption to be one of its least popular uses."


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