I'm not sure how many of you know about this, but it's pretty big news at the moment and unfortunately a lot of the news is wrong (such as 'Oh well nothing happened and everything's ok' type of thing).
The virus is very alive and busy, it's just that the change that happened today is a behind-the-scenes thing and not something normal users would notice. It's NOT an April Fool.
I'm spending as much time helping people find and remove it as I am removing dodgy software downloaded by people being directed to fake sites when they search for removal tools.
The best FAQ I have found which saves me explaining it all for the millionth time is here -
Questions and Answers: Conficker and April 1st - F-Secure Weblog : News from the Lab
By the way, if you can't access that site you've probably got the virus - it blocks certain sites. Try removing the hyphen to access the alternative version.
If you can't be bothered to read up on it just go to
McAfee Threat Center and download and run the tool (or find the one in the link above).