Back in July, I wrote a post for Lifehacker called Jerry Seinfeld’s productivity secret which turned out to be a darn popular article. So popular three sites have created software versions of Seinfeld’s “don’t break the chain” philosophy.
The three sites that let you work this magic online are SmarterFitter, Joe’s Goals and the latest construct: Don’t Break The Chain!
Each of these sites are membership sites so you do have to sign up for a free account. But if you want to forgo the purchase of a physical calendar you can avoid breaking your chain online.
via Lifehacker > via me > via Jerry Seinfeld…. 
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Just a heads up, the Seinfeldian Chain on SmarterFitter does not require a membership. =) Thanks for the link!
Would like to second M’s comment, SmarterFitter does not require registration or membership and it would be cool if you could correct that in your post.
Once again, thanks for the link.
-Tim
I’m curious about the chain, i read it. Interesting way of hacking yourself