I had 800MB of space taken up by old kernels, header files, and kernel modules. On most modern systems, this is no big deal. On my netbook, with it’s 30GB ssd, every gig is precious.
Ruby Version Manager (rvm) is a shell function that lets you easily switch between versions of ruby (and their corresponding gems). These instructions walk you through installing rvm, ruby, and rails on linux for a single-user setup (files kept in ~/.rvm). Following these instructions as root should set everything up for a multi-user installation.
You can add it from the commandline using: sudo add-apt-repository ppa:brianmercer/drush; sudo apt-get update;
Then install it from the commandline using: sudo apt-get install drush
With a rooted phone, you can use ROM Manager (from the android market) to install Clockworkmod and backup your phone. Unfortunately, with the Samsung Fascinate, you have to do some mucking around in the command line before Clockworkmod can install itself.