We remove the dates from posts on most of our Wordpress sites.
On a few others, we use Old Post Promoter to constantly update the dates on old posts.
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I swear, by my life and my love of it, that I will never live for the sake of another man, nor ask another man to live for mine.
I think its probably best to remove the date from a passive blog,a blog that gets fresh content 1-2 times a year.But i also think that leaving a date on news blogs and other websites of that nature is very important,sometimes i look at portals and news sites and dont see a date and it bothers me a lot of time.
if content is time sensitive do not remove the date
if its not so time sensitive then do remove the dates.
Example if a storm is hitting some place and you wrote an article on that then date is very important otherwise if you are writing how could Iphone OS 4 can change your life as speculation then also date is must.
but if you are writing an article describing how to change a bulb that remains constant and you can remove the dates.