Acer had a tough time in the consumer market as the iPad cut into its consumer netbook sales, giving Dell, still strong in the healthy market for corporate PCs, the opportunity it needed to edge ahead of Acer by nearly two percentage points. ISuppli analyst Matthew Wilkins says it looks like a “firm lead.” Dell also edged out Acer for the number two spot for the entire year, iSuppli says. (Table courtesy iSuppli.)

Overall, iSuppli says the fourth quarter set a record for overall PC shipments with more than 93 million units, up nearly 5 percent from the same period in 2009. For the year, global PC shipments amounted to 345.4 million units, up 14.2 percent from 302.4 million in 2009.

Lately PC market analysts have been blaming Apple and its industry-changing iPad — the second iteration of which goes on sale tomorrow – for damaging the fortunes of PC makers. In this odd case it’s being seen as hurting one to the advantage of another. I have to wonder if Michael Dell feels at all thankful.

The global PC market will suffer a rare decline this year with shipments expected to slip four percent to 287.3 million units in 2009, from 299.2 million in 2008 (click on chart to enlarge). Not since the dot-com bust of 2001 have PC sales been so slow or their outlook so grim, says iSuppli, the research outfit charting the market’s collapse.

“An annual decline in unit shipments is highly unusual in the PC market,” says Matthew Wilkins, principal analyst, for iSuppli. “Even in weak years, PC unit shipments typically rise by single-digit percentages. The last decline–in 2001–was a 5.1 decrease in unit shipments due to the extraordinary impact of the Dot-Com bust, which caused inflated IT spending levels from the previous years to collapse.”

Driving the gloomy forecast this time around: The econalypse, of course, but also, dwindling demand for desktop computers. iSuppli expects an 18.1 percent drop in desktop shipments, from 151.9 million in 2008 to 124.4 million in 2009.

Grim, I know. Still, there is a bit of good news in the report. Notebook PC shipments will rise 11.7 percent to 155.97 million units in in 2009, exceeding desktop shipments for the first time ever.

“After losing share to Intel on a sequential basis during three out of four quarters in 2008, AMD managed to reverse the trend in the first quarter of 2009,” iSuppli analyst Matthew Wilkins said in a statement. “AMD increased its allocation of global microprocessor revenue due to strong performances in each area of its microprocessor portfolio, particularly in its notebook products. This was an impressive feat given the economic downturn and the weakness in the PC and server markets.”

Of course, AMD (AMD) did suffer an econalypse-inspired revenue decline in Q1, as did Intel (INTC). And the factors that caused it are expected to persist. iSuppli figures the 2009 microprocessor market will top out at $28.6 billion, down 15.8 percent from $34 billion in 2008.