Virtual Dired directories

[Evans Winner]

A nice feature in Dired, if it doesn't already exist, might
be the ability to create virtual dired directories --
something like symlinks, but just in Emacs.  So instead of
creating a real directory and cluttering up your file
system, you just have this virtual directory where you can
act on a list of files scattered around the system as if
they were all in one place.

For example, on a Windows machine at work I have
emacsclientw.exe set as my desktop shell.  I have a
directory called ~/bin that has Windows ``shortcuts'' to all
the binary files I need on a regular basis and have
w32-integ-dired-explorer-open bound to C-c o in Dired.  This
is a nice simple replacement for the Windows start menu for
me.  But it might be easier if there were a way to simply
create a Dired ``virtual directory'' for that, instead of
having to create links to all those files and put them in a
real directory.

Anyway, a thought.  I have only skimmed the Dired docs, so
maybe it's already possible to do this, or maybe it doesn't
fit well with how Dired does things.  I dunno.