brew versions doesn't work any more, but the second part still does, thanks :)

And actually, instead of manually creating the symlink in the last step, you can brew link libxml2 --force

@anna: It should work with ST3, though I haven't had to use this for a while. Please let me know if it doesn't work though! :)

Seems it has landed in Canary too according to a comment on the Chromium issue:

76 agau...@chromium.org

this works fine in latest canary 32.0.1685.0 (Official Build 231471)
OS=Mac OS X 10.9,

Or you could just press ctrl+shift+p (OSX) / ctrl+alt+shift+p (Windows) :)

Look for this in the key mapping file (OSX):
{ "keys": ["ctrl+shift+p"], "command": "showscopename" },

There's a much easier way, you don't need to uninstall! Just use brew tap homebrew/versions, brew install node08, brew unlink node and brew link node08 for example to switch back to 0.8 from 0.10.

For more explanation see: http://stackoverflow.com/questions/3987683/homebrew-install-specific-version-of-formula