If you experience a problem leave a comment here. It does not help if you just say you can’t access the site. There are too many variables for this to be useful. Please tell us exactly what the error message you received said. With this info we can do some diagnostics.
You can help yourself too. If you have persistent errors getting to the site contact your ISP. When we changed hosts our new domain was propagated out to all ISPs so they could find us. Some ISPs may not have received the information, or didn’t properly update their tables. We can’t do anything about this, but you can call your ISP and ask them to check that they have our site properly registered.