CQ WW Phone, as it is properly known is probably the biggest ham radio in the world. For 48 hours, the 160, 80, 40, 20, 15 and 10m bands are full of activity. This coming weekend, it's your chance to take part in the 2008 event!
Even if you're a non-contester, you might tune around the bands and make some contacts. The exchange is simple; a signal report (generally 59) and then your CQ Zone number. The UK, for example, is in zone 14. You can see which zone you're in here
If you haven't the biggest signal in the world, then be patient and you might want to wait until Sunday, when the hubbub will have died down a little.
Do you want to hear what your signal sounds like at K5ZD? Work them whilst you listen here
Whatever you do, have fun!