Tables!

Could someone tell me how to make the text inside a cell in a table centered? The wintin website has some screenshots that use tables like this and I can't figure out how to do it.
Also, while I'm at it, there's a lot of other cool stuff in those screenshots that I would like to be able to know how to do. Could someone post scrips on how to do some of that stuff?
Also, while I'm at it, there's a lot of other cool stuff in those screenshots that I would like to be able to know how to do. Could someone post scrips on how to do some of that stuff?