Well, the planet Venus will transit the Sun. The good thing is that it happens on my (our) birthday, June 8th of 2004 and apparantly you should be watching it in Rome.
One of the amazing parts of these cosmic events is that it clearly shows a kind of relativity. I mean, sure the planet Venus makes turns around the Sun like any other planet does, but from Earth’s perspective it’s a different matter of course.
Historical transits (1882 Wellington) can be found here. Additionally, NASA has a page dedicated (or detailing) upcoming Venus transits.