The newest version of the SDL_gui library is now available:
http://www.newimage.com/~rhk/SDL_gui
There have been several under-the-hood changes, as well as a newer,
and much nicer looking demo.
This version was updated to use SDL_ttf-1.2.0.
Source (tarball) and Source/Binary RPMs are available.
There is also a python binding which makes it all very easy to use,
especially for prototyping.
-Ray