At present my time table does not permit me to explore new things so I have postponed delving into some areas to the next year.
However, in some cases I have made some research to get access to interesting sources and tools which I hope will help me out. LINQ is one area that is of high interest which may replace SQL within the foreseeable future. VS 2008 is the first development suite that includes LINQ.
I prefer books that target one specific area and the book LINQ in Action seems to fit in well. Actually, the book has its own site and it is also available as a PDF ebook. For more information please see LINQ in Action.
The tool LINQPAD seems to be very useful to learn and manage LINQ. It may also be more promising as it also is available for free. You can visit its homepage at the following URL: LINQPAD
The developer of this tool, Joseph Albahari, is also one of two authors of the book C# 3.0 in a Nutshell which is highly recommended if we want to learn C# together with another book, Programming C# 3.0.
Please feel free to comment available sources about LINQ as well as tools for learning how to use it.