Campwood provide an excellent free tool for checking code for issues such as cyclomatic complexity.
You can download Source Monitor from
http://www.campwoodsw.com/sourcemonitor.html.
I have found it very easy to use and recommend it to both C# and VB.NET developers. (It is also useful to C++, HTML and some other languages).
As it is an independent piece of software, it will be of particular use to Visual Studio Express users.