Welcome to DreamHost! When I tried checking your site there was a bad httpd conf error, I went ahead and resolved that for you by re-enabling the user your domain name was being hosted on.
When you connect via FTP you will want to ensure that you are connecting with the correct user. You can verify the username by logging into your panel then clicking on Domains > Manage Domains > Find the 'user:' field under the 'Web Hosting' column.
Now, looks like your site isn't reflecting any updates due to where you are uploading your files. You will want to upload the index.html file directly to the "/home/username/yoursite.com/" directory. They are currently sitting in one directory lower. You can find more information regarding uploading your site here: http://wiki.dreamhost.com/Uploading_your_site