Xjournal's Friends window has several tools for working with other applications. By dragging a person's Address Book entry and dropping it in a user's Address Card well, you can associate an Address Book entry with a person's LiveJournal account. You can also populate a new Address Book entry by selecting the desired user in the Friends window and then clicking the Add Address button.
Once a user has been associated with an Address Book entry, you can use the Chat button to initiate a new iChat conversation with the user. You can also add a LiveJournal user's birthday to iCal by selecting the user and then clicking the Add Birthday to iCal button.