Well there are ports of Squeak (Smalltalk) Cog VM on Android (CogDroid [1]), and to iOS (see e. g. [2]) which are capable of running recent Squeak and Pharo images and are development environments on their own. (Disclaimer: I am a co-developer of [1])
[1] http://code.google.com/p/squeakvm-tablet/
[2] http://news.squeak.org/2010/06/17/squeak-running-on-ipad/