I haven't noticed any down time over the last few days. Are you sure your bookmarks are pointing at the right place? Before the Great Forum Crash of 2007 the URIs were in the form of:

http://68kmla.org/viewtopic.php?t=XXXX

http://68kmla.org/search.php?search_id=newposts

Whereas, now they are:

http://68kmla.org/forums/viewtopic.php?t=XXXX

http://68kmla.org/forums/search.php?search_id=newposts

If you had a topic bookmarked from before the crash then it will give you a 404 page now...