Under Windows 7, you can open a handy All Tasks view by entering the following command in the Run dialog:
shell:::{ED7BA470-8E54-465E-825C-99712043E01C}
Windows Explorer will also display this view in any folder whose name contains that GUID (e.g. create a folder named all-tasks.{ED7BA470-8E54-465E-825C-99712043E01C}). Some bloggers call this "God Mode".
The All Tasks GUID is not presently included in the Microsoft's list of Canonical Names of Control Panel Items. This might be because the feature seems to be a bit unstable -- if I scroll to the bottom of the window quickly, Windows Explorer often crashes.