cd - のように，引数に-を指定すると直前にいたブランチに戻れる
追記：
git co master && git merge - みたいな使い方もできる．便利．
http://twitter.com/#!/jch2355/status/131665048170008576
git co master
git co some-feature
git co - # => masterに移動
git co - # => some-featureに移動
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