For most situations, spoofing a sent-screen that usually displays the vendor or persons name, is not too easy to do in the heat of the moment, without preparation, so it's not really been a problem yet.

Yes it can. Add something like this to your zsh config:

  zstyle ':completion:*:manuals'    separate-sections true
  zstyle ':completion:*:manuals.*'  insert-sections   true
  zstyle ':completion:*:man:*'      menu yes select

This does not work for me. If I type "tree -" and press [tab], nothing happens.

That's it. This thread sold me. Installing zsh now!

Tried fish yet? I prefer it to zsh ...

Try speedbar or sr-speedbar: http://www.emacswiki.org/emacs/SrSpeedbar

Neither those nor emacs-nav come close to working and looking the same way the file tree drawer in TextMate (or other IDEs) does. speedbar only shows directories, not files, when I navigate dirs in it.

You have to enable file types in the Speedbar cf. http://stackoverflow.com/questions/2220005/how-do-i-enable-S... I think you will find that the TextMate tree drawer is a toy compared to the Speedbar.

Thanks! In org-mode I can even access list nodes within the files in the SpeedBar immediately!

I agree with markokocic: Emacs is brilliant. I tested many editors but always returned to Emacs. In the beginning Emacs is a pain to learn but once you get it it's indispensable.

Shutter (http://shutter-project.org/) should probably be your cup of tea, if you like Snagit.