Emacs : PKGBUILD mode
Discovered an amazing major mode for Emacs a few days back to edit PKGBUILDs. Essentially based on shell mode with the following extra bindings specific to PKGBUILDs.
C-c C-a pkgbuild-tar
C-c C-b pkgbuild-makepkg
C-c C-e pkgbuild-etags
C-c RET pkgbuild-update-md5sums-line
C-c C-r pkgbuild-increase-release-tag
C-c C-u pkgbuild-browse-url
I especially like pkgbuild-update-md5sums-line – very useful.
It also has some other cool functions. Check it out here.
My fork of the same is available here.

Cool !! emacs madhe kahihi extensions takta yetat !! \m/
Damm, thats worth it if only for pkgbuild-update-md5sums-line