I bought "Teach Yourself ASP.NET In 21 Days" and "ASP.NET In A Nutshell". The first is an excellent introduction. I have been writting classic ASP for several years but I found the 21 Days book extremely helpful since there are so many differences in ASP.NET. The Nutshell book is meant to be a reference only. I am not as happy with it as I am previous Nutshell books I have owned. This ones seems a bit thin and the glossary (something I use heavily) is not indexed as well as it could be so information is hard for me to find.