Peter Waldschmidt has recently released a code coverage app (NCover) using the .NET profiling APIs.  This is great!  Currently it's a command line app, and I generally favor Windows applications since I'm not in the command prompt that often and typing in full paths makes me itch. 

Once again .NET has come to the rescue.  I whipped this up in no time and it serves my needs:

• Remembers NCover path, as well as last profiled app and assemblies between sessions.
• Automatically shows report after running.

I plan on adding "projects" to save configurations when I get more time.

Changes in v1.2

• I've been sitting this on a while, but wanted to get it out, so please let me know if you experience any issues.
• Added support for new NCover options: 
  • Save/Open NCover settings 
  • Set report filename
• Removed: Option to display console (console no longer used)
• Now using new NCover library instead of console, so fewer bad things can happen.

Download   (NCover requires the .NET Framework v1.1; so does this)

Source