Please note that the web client (http://www.insanejournal.com/update.bml or http://www.insanejournal.com/portal/) limits the entry properties so that "Current Mood" can only hold 30 characters and "Current Music" can only hold 60 characters. However, if you use a downloaded client that does not limit the length of these properties, you can fill in the entire 255 bytes or 100 characters. See http://www.livejournal.com/download/ to download a client. (Note that not all LiveJournal clients are supported by InsaneJournal, and that the two sites are not affiliated in any way. InsaneJournal is not responsible for the content or availability of LiveJournal.)
Additionally, there are limits imposed upon the earliest and latest dates that you can post on InsaneJournal, using the "Backdate Entry" option (See http://www.insanejournal.com/support/faqbrowse.bml?faqid=55). The earliest date posts are allowed to have is 1970-01-01, and the latest date is 2037-12-31.