Is there an acceptable use policy for this data? I'd like to make my trustmetrics stuff available again, and I could do it with this data, but it reads friends data for many users (thousands every day, even when data is cached for 24 hours) and I don't want to cause too heavy a load on LJ's servers. Is all the data it serves now drawn from memcached? That seems to be the key question that determines whether the cost is acceptable.
Of course the long term plan is to use the LiveJournal Data Protocol, but this will do as a stopgap until that's available.