In Visual Studio.Net, under the default keyboard mappings, Shift-F2 is replaced by F12. This is an improvement since I don't have to press the Shift key to go to a code routine's definition. But the equivalent for the Ctrl-Shift-F2 to jump back to the original source code location is nowhere to be found.
In Visual Studio.Net terms, the equivalent for the VB6 Shift-F2 functionality is Edit.GoToDefinition and the equivalent for Ctrl-Shift-F2 is View.NavigateBackward. I used the Visual Studio.Net keyboard customization options to assign these functions to F12 and Shift-F12 respectively. Now I once-again have the ability to investigate a routine, jump back to where I left off, and the keystrokes are more convenient and intuitive than before. I'm diggin' it.
Hope you found this helpful.