I think these ads have run their course.
Sure they are fun, but I think they should be more informative, their are many features that non-mac users still have no idea about.
I agree with this. The new MS ads are effective for 3 reasons:
1. They are tightly focused. Specifically, on people in the market for a new laptop who are curious about Macs.
2. They are concrete. This is the most effective part of the ad: they talk about money, screen size, memory, specific brands...even Blu-Ray. And all in the context about what you get with a PC that you don't get with a Mac. (And while there have been 1000's of posts here quibbling with the quality of the PC equipment, the ad is not demonstrably false, and these quibbles don't appear in the ad).
3. They discount the Apple premium as being purely for "flash" (not the program

. That's the subtext to the "Macs are cool/Macs are sexy" bit in the ads; the idea that you pay $100s more for a Mac only to look cool, even though, as a computer, it's not as good. In the last ad, the mother said that "Macs are popular among kids his age" - which suggests that people who can afford their own computer might like something more serious.
Conceptually, to counter these ads all Apple needs to do is to show that the extra money spent on a Mac is worthwhile. Apple should focus the ads on people who are either PC users thinking of switching, or on Mac users wondering if they should buy a PC next time. Ad money spent on people who would: (1) buy your product anyway; or (2) never buy your product; is wasted.
Thus, Apple should focus on the benefits that OSX brings - with a specific focus on usability and integration, and less focus on stability and viruses. In other words, the idea is to show you, the user, using OSX to do things easily. And not so much "Here I am, not getting viruses..."
Of course *how* you show something like this is the big question...one for which I don't have an answer. But I think that this would be an appropriate response.
But if there's not a way to do this effectively, then its best to not respond.