A List Apart: "When you visit the site, it welcomes you with a random language. Hola! Salut! Shalom! When you log in, the button says “Get in there” instead of “Submit.” When you upload a photo, join a group, add a contact…all of the associated text is open, encouraging, happy, and excited. And it has a significant impact on the overall user experience."
I was thinking about this a few days ago. A big part of the feeling you get when visiting Flickr, is the way they address the user. It's always happy, cool and easy. Servers are never down, they have massages. They have 'Interestingness' as the name for a feature. It's just cool.
More websites should communicate like that. It makes me like them.