Or more likely to not accomplish whatever is on the list. I read a study that claimed that the act of sharing what you intend to do makes you believe you are making progress before you even started - and making it more likely that you will not accomplish whatever you had intended.

This most likely varies a lot depending on the person. For me, telling someone what I intend to do is a good motivator (although I'm sure it would loose its value if I abused it).

Derek Sivers offers a counterargument (with citations) here: http://sivers.org/zipit