Just a couple of days ago I discovered and used Kenneth Reitz's OSX-GCC-Installer to solve the issue of installing Ruby 1.9.3 via RVM on my Mac.
Today I read on Kenneth's blog about the Command Line Tools for Xcode package that Apple added to their official developer tools suite just yesterday for Lion users.
I try to keep the number of installed packages to a minimum, so given this alternative, what's the safe way to remove what was added by the OSX-GCC-Installer?
According to the creator of the package, you can install Xcode on top of it since it is just a subset. Then you can use the uninstall command to completely remove:
sudo /Developer/Library/uninstall-devtools --mode=all
Definitely not a quick uninstall, but it should work.