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I currently host Slayer's guide from my home and, due to such things as power black-outs, accidental blowing of fuses etc., the server that currently hosts Slayer's guide is not nearly as reliable as the Mac Classics server that originally hosted the site. I'm sorry that I can't gurantee the site is up and running all the time; I feel that 'sometimes' is better than 'never' though.
The problem you encountered has been fixed, so the guide should be working again. As for the general issues of unreliability, after my final exams are over I'll do some research into improving stability (and maybe buy a UPS for good measure).