Nearly 800 O’Reilly Media and Microsoft Press titles are available for sale on Apple’s iBookstore starting today. The iBookstore is included in the free iBooks app for the iPad, iPhone, and iPod touch.

The more than 600 titles in the iBookstore from O’Reilly include Jeff Potter’s “Cooking for Geeks,” David Pogue’s “iPhone: The Missing Manual,” J.D. Biersdorfer’s “iPad: The Missing Manual,” and Mark Pilgrim’s “HTML5: Up and Running.”

Almost 150 Microsoft Press titles are also available, including Steve McConnell’s “Code Complete, Second Edition,” Ed Bott’s “Microsoft Office 2010 Inside Out” and William R. Stanek’s “Microsoft Exchange Server 2010 Administrator’s Pocket Consultant.”

iBooks is Apple’s ebook/PDF reader for the iPhone and iPad. iBooks works with the The iBookstore features books from major and independent publishers. Once you’ve bought a book — or downloaded a free one — it’s displayed on your Bookshelf. Just tap it to start reading. iBooks is a free download at the Apple App Store.