Here's another one I wrote a while ago but never Posted. It's simply an alternative view of the standard NCover XML report. (If I remember correctly, I took the idea from someone that wrote a VS.NET add-in. I prefer to do stuff outside of VS, thus this.)
Features:
Nodes in tree show aggregate completeness. Anything less than 100% is colored red.
Clicking on a class displays the class Visit info, clicking on a member displays only that member's info.
Visit information is colored red if visit count is zero.
Unvisited lines have the familiar red squiggle under them.
Drag & drop file on app to load, File|Reload to reload.
Print source files.