Here's one reason to take the hardcover of David Sedaris' new book to the beach this summer instead of the digital version for Amazon.com's Kindle: Sand between the pages won't ruin a good story.

About six months after its introduction, the Kindle electronic reading device is entering its first beach season amid increasing signs that the gadget may have a future. Skepticism about whether people will read books on a screen instead of the printed page is being countered by evidence of a nascent but growing market for the Kindle and its competitor from Sony Corp.

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Jeff Bezos, founder and CEO of Amazon.com, holds the Kindle; a portable reading device about the size of a paperback. With the press of a few buttons, you can instantly -- and wirelessly -- search out and/or download more than 110,000 full-length books and audio books, as well as major newspapers, magazines and blogs. Each e-book you buy costs about $10, daily newspapers $10 to $14 a month.
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Much of the talk focuses on a comment by Jeff Bezos, Amazon's founder and chief executive, who for the first time said the Kindle is having an impact on book sales.

"Of the 125,000 books available both as a physical book and on Kindle, Kindle books already account for over 6 percent of units sold," Bezos said in a statement coinciding with a recent trade show.

On the other hand, Amazon won't disclose how many people have bought a Kindle, reduced to $359 from $399, or how many e-books have sold for the device.

Nonetheless, publishers are making more titles available for the Kindle. Simon & Schuster Inc. said it would add 5,000 titles to its Kindle offerings after the company's e-book sales grew by 40 percent in 2007.

E-books represent the fastest-growing category for publishers, though the sales volume is tiny compared with traditional books. In 2007 sales rose by 23.6 percent over 2006, to $67 million. Overall, the book industry grew by 3.2 percent in 2007 on sales of $25 billion, according to the Association of American Publishers.

E-books' future debated Ross Rubin, an analyst for the NPD Group, said it's still too early to say if e-books will have a big impact on book sales, but the category is emerging.

"There are only two players, and publishers are just starting to open up their catalogs," he said. The other player is the Sony Reader Digital Book.

Rubin said that the Sony product had a "decent holiday season" last year and that the $299 device has some form-factor advantages over the Kindle.

"It's a thinner and simpler product in some ways," he said. NPD is tracking sales for the Sony device, but it won't disclose details.

For small publishers, the Kindle can provide a new outlet for sales.

"I think for small presses such as ours, whose books are often not available as readily, something like Kindle may actually increase sales," said Donna Shear, director of Northwestern University Press. "The groundswell has shifted among small presses, who for years might have resisted electronic publishing.

"The physical book is not going to go away, but this is another viable delivery system, and we have to think of it as an opportunity and not a threat."

The Sedaris book, "When You Are Engulfed in Flames," is being released Tuesday in hardcover and electronic formats. The title is expected to be "our big hit for the summer," said Robert McDonald, book buyer at Chicago's Unabridged Bookstore.

"In some ways, booksellers may have had their heads in the sand. We love the written word, and maybe we've scoffed at e-books in the past. That's unfortunate," he said, but added there's little the retailer can do about it since e-books aren't sold through bookstores.

One tactic is to provide service and extras digital retailers can't offer. Unabridged will sell signed and personalized copies of the Sedaris book to customers who prepay.

"In our store, we try to have a full-time staff of people who love to read, who can talk knowledgeably about a wide range of books," McDonald said.

Rubin thinks sales will keep improving, but the Kindle won't duplicate what Apple and its iPod have done for digital music.

"For Amazon, unit volumes don't need to be at an iPod level, or even near an iPod level, because they have an absolute lock on the product," he said, selling both the hardware and the software, the books.

Best-sellers can be had for about $10 on the Kindle, while prices for other titles vary.

Electronic books aren't "going to replace the leather-bound classics a collector wants, but as a substitution for paperbacks, business books or summer reading, it's a good fit," Rubin said.

Just beware of the sand.