Visual Studio.NET Error List and Task List
Here is a great article that explains the Error and Task List within Visual Studio. The Error List shows any errors and warnings within your project and the Task List helps you track your progress and mark items as completed just as you would with an external todo list application.
Read more at http://en.csharp-online.net/Visual_Studio_Web_Applications%E2%80%94Error_List_and_Task_List
