Other options would be Python 
http://www.python.org/) (replaced SCUMM at Humongous Entertainment) or SeeR 
http://home.elka.pw.edu.pl/~ppodsiad/seer/) (I used to think that AGS used this, but as I didn't find information about the other on both sites, I'm not sure anymore.) 
 Anyway, I'd go for either Python 
http://www.python.org/) , because it's a easy to learn, powerful, efficient and elegant programming language (used in Backyard Hockey, Freedom Force, Severance: Blade of Darkness, Star Trek: Bridge Commander, QuArK,...) , or with LUA 
http://www.lua.org/) , because it has proven that it is capable of the task as well (Grim Fandango, Escape from Monkey Island, Angband, Baldur's Gate, MDK2, ...) and the MAD Adventure Game Engine Project 
http://mad-project.sourceforge.net/) uses it as well.