What is your favourite shell script GUI/CLI editor and why?

I love Geany

It's a quick GUI editor that can manage small projects if necessary (it can remember list of files and a few other neat things). It supports many syntax highlighting including Shell scripting.

It supports plug-ins, and I have used the VC (version control) plug-in once, but the basic features of Geany are enough for most of the work I do with it.

gedit can be a great editor when extended with gedit-plugins

I found this: http://www.vim.org/scripts/script.php?script_id=365

It is really good for bash scripting.