Microsoft have launched a new web site Microsoft Book Store (http://www.microsoftbookstore.com/). All the Microsoft press books, and books by other publishers targeted at Microsoft products are available and dispatched through Amazon.
Good place to keep abreast of the latest books coming out of Redmond and its authors.
Of course, you’d be hard pushed to beat SitePoint’s very own ASP.NET book…but I would say that wouldn’t I? :)