I've heard from a few sources that there is some sort of virus called the "Conficker Worm" (also Downadup) that has millions of computers infected. And apparently it is supposed to do something (bad I'm guessing) on April 1st. I've no idea how wide-spread this virus is, but I suggest that nobody turn on/have on their computer at this date. It's only affecting windows luckily, but as I'm not positive, perhaps all platforms should be wary. I just learned myself that it has been around for quite a while, but April 1st is said to be the date it does... whatever it is told to. Microsoft put $250,000 USD into trying to find this virus, and many companies are planning on turning off their computers for that day.
Now, I'm fairly skeptical with all this, but as far as I can tell, keeping a computer off for a day is far better than having who-knows-what occur. So, I suggest everyone do so, and please spread this message to anyone else who may not know about it.
If everyone here pretty much took this information as common knowledge, I apologize for my naivete. And for those who don't believe me, search for it on google or something.
As an edit,
http://www.bdtools.net/ offers a tool to remove all versions of the worm. Using this might not be a bad idea either, but I haven't tried it, and have absolutely no idea if it is safe. Sounds safe enough though.