What is your favorite editor or IDE for programming in Ruby?

This trio seems popular:

http://www.scintilla.org/SciTE.html
http://www.vim.org/
http://freeride.rubyforge.org/wiki/wiki.pl?HomePage

I just came across these recently:

http://www.anyedit.org/	 (can you add ruby code-completion? :)
http://www.crimsoneditor.com/

Any other free ones worth trying out?  One that supports both C/C++ and 
Ruby would be nice :)