I've made an application which works as a front-end for ScummVM. It will only run under MacOS X. Instead of all the hassle with terminal commands etc., just launch this application, select your game and press run. Simple as that. You only have to locate scummvm and the folder containing the data once, after that you can just launch and run. That's three mouseclicks :). I find this application very useful myself, and I hope that someone else will have any use of it. The application can be found at:
http://w1.864.telia.com/~u86428755/scummvm_frontend.sit)
Please try it out and tell me what you think. Many OSX users seem to have trouble getting ScummVM to run, I hope this helps a bit.