I got a holiday email from the Bing team inviting me to download a free music mp3 from Amazon. After getting a code to redeem for $1.29 in credit, I was directed to Bing Music where I could search by song, artist and/or album for what I wanted. Once there, I could select an option to buy the track from Amazon and use my credit. I got something I genuinely wanted for free, and as part of that experience I discovered how Bing Music works. Well done, says I.(I picked Queen's "We Are The Champions", having realized that, inexplicably, I have almost no Queen in my music collection anymore.)
Google also did a great job with this year-end video of showing off their products and features without it being about their products and features: