If you still haven’t explored the features of .net framework 3.0/3.5 well here’s another one for you: .net framework 4.0 and, to complement it, Visual Studio 2010.
The most interesting and promising new feature for me is about the “no-repro” bug. Reproducing bugs is one of the most difficult tasks a developer or a tester encounters but is one of the most crucial in order to develop a “good” software. This new edition includes “a set of tools for managing test cases and execution as well as improved support for filing actionable bugs.”
The product is expected to ship in fiscal year 2010, so I guess we still have some time before we have to learn another .net framework.
For more information on this visit http://msdn.microsoft.com/en-us/vstudio/products/cc948977.aspx. You may also read about the article from cnet news: http://news.cnet.com/8301-13860_3-10052412-56.html?tag=nl.e703.