Platinum guests (10+ Carnival cruises) get alot more stuff.....
I believe there is a complete list on the Carnival.com site somewhere.....
VIP check in
a tray of canapes in your cabin
free laundry service
there are more...but these are the ones that I remember.
Im working on number 6 - only 4 more to go.
Carnival Inspiration 2/2011
Carnival Splendor 2/2010
Carnival Imagination 8/2009 B2B
Carnival Triumph 11/2008
Carnival Celebration 10/2007
Carnival Victory 11/2006
Disney Wonder 1/2006
Carnival Legend 10/2005
Carnival Victory 3/2005
Carnival Triumph 8/2004
Carnival Sensation 6/2002