The nerds in MailChimp Labs just unveiled a new experiment called the Subject Line Suggester. It’s kind of like Google’s Keyword Tool, but for email marketing. It’s a free feature for all MailChimp users.

You basically enter some words or phrases that you were planning to use in your subject line, then MailChimp will compare it to all subject lines ever used in our system, their resulting open rates, and then tell you how they performed.

For example, let’s say you want to send a holiday campaign, with the subject line “Holiday Gift Ideas:”

Hmm, maybe you’d like MailChimp to suggest other words or phrases…

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