Have you seen the new Apple ads for the Mac?
Apple have been very quiet on the PC front, possibly since the release of Vista they see a time where a customer is making a new PC choice due to the demands on the hardware and an opportunity to get in front of the punters to see if they can make some inroads.
I dont think it will make too much of a difference, people are very resistant to change and to move from a Windows machine to Mac is a big step.
Thats possibly why Apple is using very emotive TV ads to put their point across. Viruses, iLife and other things to make Macs more appealing.
Have a look at these http://www.apple.com/getamac/ads/
However, 90+% of the market is hard to ignore, so it may take a while…
Till Next Time