The ruling effectively differentiates individuals from the conventional news media, which can be sued relatively easily for libel, in that there is an assumption that the media checks their facts.
This, of course, does not mean that I'm not right, or that mainstream sources of news are somehow more right than I am. It just means I'm off the hook. I can say whatever I want to say, so long as I link to someone else who can be blamed for it. ;->
*addendum* - I'm lifting this cartoon from Spoonbender's post in Reverse Cowgirl's weblog, as it seems kind of an appropriate one to sum up the weblogging phenomena.