These are some of the Party Poker Bonus Codes:

OPWFREE - Free qualifying entry into a Party Poker Million Tournament, $32 value, their recommendation.
FOOBONUS1 - Free $25 bonus when you sign up as a new player.
SITFREE - Free entry into a Party Poker Million Satellite Tournament, $32 Value.
OPW25 - Free $25 when you sign up.