One psn account... Multiple ps3s

[chchau]

Hey guys,

i just recently sold my 40gb ps3 and well, i forgot to delete my user on there. i have downloaded add-ons and games on there. i went to a friends house and changed my psn password and all to make sure he cants access my account.

my question is........ can i still use the same user name and access my psn on a new ps3 (which im getting at the end of the week) and redownload all the material without problems ???

also.. if he does log onto my user account on the ps3, and i log on, on the new ps3, is there conflict since there would be two ppl logged on as the same time ???

thanks for the help and hope i was clear enough