The OMR (Optical Music recognition) feature of music typesetting (like Finale has).
That is - I would like to be able to scan a music score and import it to LilyPond.

Linus, Do still care about the desktop? Does it need better leadership?

What is your current view on Dijkstra classic claim:
    "go to statement considered harmful"
in Communications of the ACM / March 1968

Clean directories, change file permissions, etc. can be easily done using the 'dired' function of Emacs.

Emacs is a necessity for me.
For editing local and remote (via tramp) files.
Run simple shells, compile, grep, diff, clean directories. All within emacs.

Richard M. Stallman already said similar things in his
    http://www.gnu.org/philosophy/no-word-attachments.html
2002 article.

Would you consider pushing a more popular glue language for Emacs?
Have you looked at Pymacs ?

What's your opinion on Google's lack or annoyingly late native Linux support
for their client applications - (Picasa, Google-Earth, Google-Drive)
?

IDE ? I live in Emacs!
There I can edit, compile, grep, open-shells, and run gdb that utilizes emacs buffers.