I myself add a ton of dev apps and have hit the wall on space, to aleviate the issue I move things from the root directory to my home directory and symlink them. I typically move the apt cache directory, webkit libs and mozilla plugins.

here are some helpfull commands

find files over 5,000 KB | exclude the home directory | print the files and their size

and then you can move and symlink what you found

for noobs to symlink

I hope this helps some people if anyone else has suggestions share as well I have reflashed the phone 3 time because of dev app problems and it is bothersome to redo this everytime.