I've seen other people do it often... it's like an announcement that's always the first post you see, stuck up there no matter how many pages back or forward you jump in the time span. I'll tell you if I find it out...
It looks like all you need to do is put a future date on your post and use the backdate option. Details are here: http://www.livejournal.com/support/faqbrowse.bml?faqid=91
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Date: 2004-01-07 04:47 pm (UTC)no subject
Date: 2004-01-07 05:04 pm (UTC)no subject
Date: 2004-01-07 05:16 pm (UTC)no subject
Date: 2004-01-07 05:26 pm (UTC)http://www.livejournal.com/support/faqbrowse.bml?faqid=91