I am not a huge fan of their journal service compared to LiveJournal but i noticed they had a "Tag box".
Take a look:
http://immorak.bravejournal.com/
I tried to get the Tag box on my LiveJournal by taking the source code of the BraveJournal tag box and putting it into an iframe. This did not work.
If anyone has any suggestions on how this could be done, or if it can't, that would eb great.