The growth of the iPad is helping Kindle eBooks sales, according to new research from Cowen and Co.

The LA Times reports: “Turns out the iPad has actually helped Amazon. Not only are sales of the Kindle device expected to grow 140% this year to nearly 5 million units from 2009, but digital book sales via the Kindle store are on track to grow 195% to $701 million in 2010, according to Cowen and Co., which released a report Monday on the digital book market.”

Interestingly, according to the report, one in five people who buy eBooks from the Kindle store do not own a Kindle. The report also found that among readers who read more than 25 books a year, 44% prefer using Kindle on the iPad, while 47% prefer iBooks.