I hope I'm posting in the right section. I didn't find quite what I was looking for in search, but here goes:

I transferred my data from my powerbook (10.4.11) to my new macbook (leopard) via the migration assistant. The files, folders and apps from the powerbook HD went over without a hitch, but it looks like that was it. My iTunes library didn't come over, some programs the I bought required passwords and stuff like that. Even when I go to the user folder, I see my powerbook account, but it it says i don't have sufficient access privileges
What did I do wrong or what else should I do?