In some respects, there is no need to migrate from Livejournal, as such. It's great.. one thing I can't offer here is the 'friends' feature, and all the othe great stuff the LJ offers.
This posting is for people who wish to either include their LJ data in a Drupal site or to leave LJ behind and import their data wholesale into a Drupal Blog.
When I started playing with Drupal I tried to import my LiveJournal in several ways... You may be happy with one of these. These are listed in order of best integration with Drupal.
If anyone see a mechanism for making their export system any better 1) email me. 2) email livejournal..!!