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If you are making a game you could use something like http://unity3d.com/ which allows you to package it for Windows, Mac OS X and web based play all from the one Mac OS X development environment. I think a 30 day trial is available.

Hey, thanks for that link. At my district we use Alice for game design classes... it's free but I don't mind spending dough on something THIS good looking. How popular do you think it would be for the students to make iPod and iPhone apps? Holy cow, I'll be a hero!
 
Hi,

If you're writing a game you might be interested in the scripting language Lua. It's very easy to embed Lua into an app written in C, Objective-C or C++ and is therefore ideal for a standalone cross platform game. Lua is popular with game developers so if you want to make it easy and appealing for people to contribute then Lua might be a good choice.

b e n
 
(I have sold legal software on the open market):

...? As opposed to what? Illegal software on the black market? ;)

For the OP: I'm sure everyone's chimed in with some fantastic advice, but I saw you mention RPG. If you haven't already, make sure you take a gander at some of the stuff Jeff Vogel has written about his experiences writing RPG shareware adventures for the Mac and PC, he shares some very good insights: http://www.spiderwebsoftware.com/otherpg.html#otherstuff
 
Hey, thanks for that link. At my district we use Alice for game design classes... it's free but I don't mind spending dough on something THIS good looking. How popular do you think it would be for the students to make iPod and iPhone apps? Holy cow, I'll be a hero!

Sounds like the kind of class I would have loved to have been in when I was a kid. Good luck with it.
 
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