Works for me.
I take it you have done the obvious and given them a ring or an e-mail? Contact details are on the login page.
As a result of massive numbers of inactive users (caused by people forgetting their login details and simply re-registering) they carry out periodic sweeps and delete logins that are not in regular use. If you've not used the site for a few months you might have been caught out by this.
Or of course it could simply be that you've misrembered username or password.
Mike