Our collegue from Labs NIC.CZ, Jíři Machálek, has described in latest blog post how to hack well known website via unreadable javascript code. The only protection against such an intrusion is javascript blocker in browser. How the attacker was making money from that is very well described on NIC.CZ's blogpost "Bezpečnostní incident v číslech: napadení známe webové stránky".