I will start teaching an introductory programming course (high-school level) using Processing in mid-September.  I'd love to use Processing 2.0 to show the students how dead easy it is to develop an Android app or a browser game using Android and JavaScript modes, respectively. I haven't used the 2.0 alphas extensively myself yet, though.  Do you people think it's stable enough in its current form (I just downloaded alpha9) to use in the classroom or would you recommend staying with 1.5?