ohloh.net is a service that analyses the source code of open source projects and creates statistics.
Click on this button to see the statictics for the SharpDevelop repository: 
All information on that page was automatically created by the service by looking at the subversion repository. It is wrong on the following points:
- project age. Only the public repository of SharpDevelop 2.0 has been analysed. Earlier work on SharpDevelop 2.0, and the whole work on SharpDevelop 1.x and earlier beta versions is not included in the statistics. Old code taken over to the new repository was attributed to Mike Krüger.
- License. It has found license headers in the source code of log4net and other libraries/tools included in the repository. That code is attributed to the person who added the library to SharpDevelop. The real license for SharpDevelop code (LGPL) is not found at all because we don't use the standard LGPL header.
- The line count is slightly wrong for the same reason as above.
- Only contributors having commit access are mentioned, patches are attributed to the person who checked in the patch.
On the contributors page, you can see activity graphs for the individual developers. And you can see the comment ratio, which unfortunately is quite low (far below C# average according to the "Factoids"), but other popular open source projects like Firefox, OpenOffice or MediaWiki seem to have the same problem.