A new VHDL textbook was released a few days ago. *Yawn*, right? There's like a hundred of those on Amazon already.
But the good thing about this one is that it covers the basics of using VHDL in a concise and attractive 129 pages. It goes over the syntax and semantics of the language and illustrates behavioral and structural description styles with an emphasis on synthesis. But you don't have to take my word that this book is good - you can download Free Range VHDL for free!