I've been working with ASP.NET for 9 years now and still there are plenty to explore. Apart from my day to day (boring)coding, my focus has been into faster and SEO friendly web development and worked with jquery/json lately.
Microsoft has released their latest version of ASP.NET 4 and obviously the focus also into faster and SEO friendly web. I have collected all the important new features and compiled into a simple article which was published on Simple-Talk. Have a look at it and send me your comments.
I'm working on a small booklet with comprehensive instructions to speed up your web applications and also developing a simple web toolkit which will help developers to easily integrate jQuery into their ASP.NET web applications. Both of them will be released soon, so stay tuned.