Rating: 

It is quite a short book weighing in at only 280 pages however the amount of very useful information contained within those short number of pages is staggering.

This book is taken from the perspective of building your own fully Ajax enabled web portal and is based on a production web site Pageflakes (http://www.pageflakes.com) . Omar guides you through design and implementation decisions that you need to think of when constructing your web site, scalability decisions, performance decisions, security considerations etc.

On the code side of things the sample site that this book is based on uses all the up to date technologies that Microsoft has released including Ajax and Windows Workflow. Omar explains best practices on building a website, N-Tier architectures, using interfaces for pluggable components to your site etc.

This is the best book on .Net programming I have read in a while and there is a lot in it from both the architects and the developers points of view.