Ajax shortcodes and widgets to allow visitors to sign up to Campaign Monitor (http://www.campaignmonitor.com) lists
Simple to use and elegant. I like plugins that don't try jam pack everything into one. This is a Campaign Monitor widget that submits using ajax, no more, no less.
It is also impossible to change the labels which would be extremely easy to implement using filters (however, author has said he will not add this feature to the free version which I can respect as everyone needs to eat).
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