Have just started developing a 2Channel browser for Google Android. This project will be developed as open source, and will be available at the Android Market for free.
The inspiration came from different Linux 2chan browsers as Kita2 and JD 2ch (both available for Ubuntu, using Synaptic), as well as Gikolet.(J2ME)
It is still not decided if I will reuse any of the code mentioned above. Kita2 was written in Ruby, Gikolet in Java but looks like the porting effort will be more difficult than rewriting it.
Stay tuned for this project progress as I expect I can provide a prototype in a few weeks.