I learned a bit of realbasic when I was learning c, cus I thought it was a pretty daunting task. Well the interface and actual programming in future basic is easier, but a real C compiler is quite a bit more powerful. If you really want to get into the guts of programming learn C, and use developer and you can do pretty much anything. Developer can compile carbon apps to, which means that they should be cross compatible with OS 9.
Learning C is easy, but learning the Apple API's (the libraries used to draw pictures, work with windows, and make sounds) is a hell of a task, but worth it. I am making a game for OS X with a bunch of other guys, and I really need everything that OS X and c, c++ offer. Oh ya, and objective C, which is used in cocoa programming for OS X is also really cool.
Make the switch, it will take time. Not only will you get to program for OS X, but you will get to do a lot more things that you might not have been able to do before.
[ 12-05-2001: Message edited by: 11011001 ]