This extension gives you ability to search for processes and then attach to them. It automatically saves selected processes between Visual Studio restarts. You can easily find apppool specific processes and attach to them. Extension has attach shortcut key, by default it is Ctrl+Shift+Alt+F5. You can attach to multiple processes at once. If you are web developer then you must have it.
The extension supports Visual Studio Development (Cassini) server and IISExpress. For the Visual Studio Development server it shows port number in parenthesis. For the IISExpress it shows site name in parenthesis.