Grails: A Quick-Start Guide (also known as GQuick) is aimed at helping developers learn Grails in a hurry. I got the idea for this book through my experience working with a team of Java web developers who were new to Grails. This book would have been a great help to us then and I'm hoping it will be a help to others in similar situations. I am also looking at this book as a contribution to humanity: helping all those poor souls who are struggling day in and day out with JSP, Struts, or (as I was) with JSF & EJB. So, if you know someone like that, go to the Prags website, download a copy and change a life!
The beta means that you can purchase an eBook which contains the first 2/3 of the book and get regular updates as it gets completed. You can also post errors and suggestions to help make the book better. When it's all finished you get the complete edited eBook. There is also an option to pre-purchase the paper book which should ship later this year (I'm hoping for September or October).
One last word about the Pragmatic Programmer's ebooks in general. They are awesome! You don't just get a PDF. Your Prag ebook is available in PDF, epub (for iPhone) or mobi (for the Kindle). You don't have to choose just one either, you can download a copy in any or all the formats. I have several Pragmatic Programmer's titles on my iPhone and they look great.