Current JEDI-SDL Page at the JEDI site: http://www.delphi-jedi.org/Jedi:TEAM_SDL_HOME
JEDI-SDL Project under SourceForge: http://sourceforge.net/projects/jedi-sdl/

Stojkovic's SDL Page(you'll find the GUI-type libraries here): http://sdlcontrols.sourceforge.net/

And if you really want to learn what SDL can do: http://www.libsdl.org/