How many Kindles are out there? To date we’ve only heard the vaguest of anecdotes. Now some theoretical numbers: According to Asian tech pub Digitimes, the Taiwanese company that makes the display module for the Kindle and other e-readers is shipping 60,000-80,000 of them monthly and expects that number to hit 120,000 by the second half of the year. [via indiekindle]

Prime View International, which manufactures the Kindle’s 6-inch electrophoretic display (EPD), says 60% of those displays go to Amazon. That means Jeff Bezos is ordering up to 48,000 per month–and the number could approach 72,000 by year’s end, if PVI’s forecast is accurate.

 Also, the Kindle could contribute 3% of Amazon’s overall revenue in two years, argues Citi analyst Mark Mahaney, who has a born-again relationship with the device. Combining device and book sales in an iPod/iTunes-like model, Mark says, the Kindle could add $750 million to Amazon’s top line in 2010. [via alleyinsider]

After six weeks without product because of booming demand, BooksonBoard now once again has Cybooks available, this time with increased on-board memory (easily allowing for the storage of up to 500 eBooks) and longer battery life.

BooksonBoard (www.BooksOnBoard.com), a leading provider of eBooks and audio books, shipped the first back-orders today and has enough units to fill new demand for a short time.

At a new reduced priced of $379 (including $25 worth of new eBooks for free from BooksOnBoard), the Cybook Gen 3 Ultralight is 30% lighter than the Sony Reader and 50% lighter than the Kindle.

“Weight is very important when you’re trying to hold a piece of hardware for hours at a time while you read,” says Bob LiVolsi, CEO of BooksOnBoard, “Plus the Cybook uses the Mobipocket format which is generally available and an industry standard.”

The Ultralight North American bundle includes $25 toward eBooks or downloadable Audiobooks, premium leather case, USB charger, and USB cable.