I've mentioned before a website that both Jean and I love, that is Phil Plait's Bad Astronomy blog at Discover Masgazine. Phil used to work on the Hubble and is one of the most requested astronmoers out there, having wirtten several books, including "Death from the Skies", hosted his own series on the Discovery channel and many, many articles on the web.
His site has a bunch of web links for Tuesday's Transit of Venus across the sun. It's located HERE.
Unless you're going to be around for the next one in like, 117 years, now's your shot!