I’d been expecting there was going to be a lot of new Kindle owners after Christmas, but now a business news service is backing me up. By the end of the year, Amazon will have sold more than 8 million Kindles, according to new statistics from Bloomberg. And it’s not just a prediction. They’re reporting that number came from “two people who are aware of the company’s sales projections.”

I have to wonder if this is a deliberate leak by Amazon. Amazon’s never shared their sales figures before, until Monday, when they finally revealed they’d sold “millions” of Kindles — just in the previous 73 days! It must’ve been hard keeping that secret, while Apple continued bragging about how fast their were selling their iPads. But in fact, Apple only sold 4.19 million iPads between July and September, and for the rest of the year, Bloomberg’s analyst has predicted that Apple will sell only 5 million more…

I’d like to give a big welcome to all the new Kindle owners. (In a few days, I’ll be publishing a few of my best new tricks for the Kindle!) And if you’re wondering if you should’ve bought an iPad instead — don’t. The selection of books is much smaller in Apple’s store, according to Publisher’s Weekly. “Want an e-book version of the nation’s bestselling nonfiction hardcovers? Don’t bother looking on the iBookstore. Apple still hasn’t struck a deal with Random House, publisher of current hits like George W. Bush’s Decision Points and Laura Hillenbrand’s Unbroken. For now, iPad users who want to get any of Random House’s bestsellers — which also include John Grisham’s The Confession and Stieg Larsson’s The Girl with the Dragon Tattoo — need to visit Apple’s App Store and download the free application for the Kindle or the Nook.”

Publisher’s Weekly notes that Apple offers just 130,000 books in its iBookstore, vs. the 300,000 applications in its app store — and you can’t even access Apple’s iBookstore from your computer, but only from a mobile device!

Maybe there’s a “stealth revolution” underway, and the Kindle’s popularity is Amazon’s own delicious secret. But if that’s true, then it’s got me curious. What kind of Kindles are people actually buying? I decided to ask a friend who publishes a popular technology site, and they agreed to anonymously share the break-down of their own sales for the last 30 days. They’d sold 90 Kindles — more than $13,000 worth — but eighteen of them were 2nd-generation Kindles. (Which is exactly 20%…) Almost two-thirds of their sales were for the new, cheaper WiFi Kindle — but that’s probably because Wi-Fi Kindles were specifically mentioned in Amazon’s ads. (“The All-New Kindle. Built-in Wi-Fi. Only $139…”) Since they’re only available in the new black color, this suggests we may start seeing fewer people in 2011 who are still carrying around the old-fashioned white Kindles.

Although maybe not. My friend’s web site also sold 15 of the new Kindle model that ships with both Wi-Fi and 3G connectivity — and only three buyers requested the graphite-colored Kindle. With this model there’s a choice of colors, and given a choice, 80% of the shoppers apparently went with a traditional white Kindle. And if you’re a new Kindle owner, remember. If you wrap your Kindle in a rubber “skin” you can change it to other colors, like blue or pink!

If I could send one message to all the new Kindle owners, it would be this: that owning a Kindle is a lot of fun. And remember that the Kindle is surprisingly flexible. Besides ebooks there’s also a great selection of games for the Kindle, and you can even use it to read your favorite newspapers and magazines. (Not to mention some great Kindle blogs!) So to all the new Kindle owners: happy holidays

And happy Kindle-ing!