My friend José Miguel Torres has just published a brand new ebook on SQL Server Compact Edition; if you are a guy that is doing mobile devices development this book is a must; unfortunatelly the ebook is only available in Spanish.
This is the reference to the news:
You can by the book from here:
By the way, if there are many English speaking developers interested on the book, the editor may consider translated to English... If this is your case, don't hesitate contacting the author.