Uses virtualenv to install a fresh ipython 2.0 (with interact !) in a new subdirectory. I wanted this to try out ipython 2.0 on my older ubuntu workstation.
Using this script, and starting the resulting ipython in your dropbox directory is very handy.
Takes a while as it compiles numpy from source.
./setupIPython2.sh ipython2
. ./ipython2/bin/activate ipython notebook --pylab inline