“Time Since” for comments and entries?

Hi everyone –

I’m trying to make the time stamps on my comments and entries more user friendly – the desired effect is virtually the same as this forum, where (for example) in each comment on a blog entry the time will be written “1 day 3hrs ago”…

I’ve searched around and have come across a few old techniques here, here and here.

Can anyone give some advice on how to get the desired effect?? Either plugin or hack.

Many thanks – Leon.