What's the best programming environment for programming in scheme for Gimp 2.6? Does Guile integrate well with Gimp?
EMACS, of course. It's the best environment for everything.
Seriously, best how? GIMP scheme is Guile, so both EMACS and VIM should do well; Eclipse has a scheme plugin, as I recall; of course there is PLT Scheme/MzScheme etc.