I have 4 accounts on my PS3, and I was able to download 2 games for each account.
USA - Mine - WipeOut HD + Fury / Little Big Planet
USA - Son's - Super Stardust HD / inFamous
EUR - Dead Nation / Ratchet & Clank
JPN - Store not up yet, so no free games yet, but I am confident.

I was able to download every game offered in the USA and EUR welcome back deals, so heads up to anyone out there with multiple accounts. Not a bad deal at all, as long as my CC does suffer from the initial identity theft. heh
Also, my son's account is a sub account of mine, but he was still able to get in on the deal.