Apple’s Get a Mac commercials have been running in the U.S. for about a year and a half now.

Each commercial promotes a clear Mac advantage and tells viewers that Macs are…
better — Counselor, Genius
compatible — Network, Self Pity, Touché
cool — Sabotage
creative — Angel/Devil, Better Results, Better, Flashback, iLife
easy — Now What, Out of the Box, Stuffed, Surgery
for home — Meant for Work, Work vs. Home
lovable — Gift Exchange, Goodwill, Santa Claus
popular — Boxer, Sales Pitch, WSJ
powerful — Misprint
robust — Tech Support, Computer Cart, Restarting, Trust Mac, Viruses
well-made — Accident
Some of the commercials also mock Vista, but most focus on the Mac to tell you that Macs are better than PCs.
At least, that’s what they seem to say.
But by showing two people onscreen rather than two computers, the message is made personal. Beyond anthropomorphising the computer hardware, showing the Mac and PC as people shifts the focus to the users and plays to one of Apple’s acknowledged strengths: focus on the user. Like Apple’s new video guided tours used to promote iPhone and iPod touch, and like Apple’s product names themselves, these Get a Mac commercials are easy to use from the user’s perspective: have a quick laugh with two familiar faces, and learn about a Mac advantage.
Long ago, Apple popularized the graphical interface over the command-line by showing users their available choices rather than forcing the users to choose arcane commands. These commercials provide a similar and simple choice to (young?) style-minded users: do you want to be like Mac, or PC? Not “which do you want to use?”, but which do you want to be like? A video menu of sorts: choose one of these people.
And while you watch the commercials, you subconsciously choose Mac.