Uninstall
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cd `brew —-prefix`
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rm -rf Cellar
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brew prune
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rm -rf Library .git .gitignore bin/brew README.md share/man/man1/brew
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rm -rf ~/Library/Caches/Homebrew
http://superuser.com/questions/203707/how-to-uninstall-homebrew-osx-packet-manager
Reinstall
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/usr/bin/ruby -e "$(curl -fsSL https://raw.github.com/gist/323731)"
https://github.com/mxcl/homebrew/wiki/Installation

Got a typo on the first line:
cd `brew –prefix` <– should be double dash
Thanks! Actually I had it as 2 dashes, but the syntax highlighter (geshi) does something weird with them. I’ve put 4 dashes and now they show as two, but they don’t look completely right.