This website is just pure nostalgia. FFonline.com is one of the oldest websites with resources for Final Fantasy, it has been online since 1999. But not anymore..
If you try to access their website, you will see “This Account Has Been Suspended”. This usually happens when your webhost has suspended the page. Probably the administrators of the website don’t care or they have forgot to pay their webhost :).
Anyway, hopefully someone will take over the website and put it back online. They had a forum that was epic.
Those really interested to see the website again can check this mirror here: http://web.archive.org/web/20110304182409/http://ffonline.com/
Update
“FFO was hacked and it looks like it’s never coming back. If you haven’t made your way to Final Fantasy Society, the new home DH has made for us, head over there. Login details for the beta can be found on the FFS Facebook.”
Taken from their official Facebook page.