I was in the Denver area for work last week and managed to check out the casinos in Central City and Black Hawk. Here's a list of the current slot cards and what changed....

Riviera - same design but different color mag stripes
Red Dolly - latest gold card has same design as last but mfg mark changed from PPC to ABL
(would only give ONE)
Easy Street/Bonanza - no change
Century Casino - no change
Johnny Z - no change
Ameristar - no change
Golden Rewards - entry level black card is unchanged but they have new higher level cards,
new 18 Karat and Royal cards exp 6/30/11
Bull Whackers - no change
Wild Card Saloon - no change
Bull Durham - no change
Canyon - new entry level PURPLE "Canyon Club", upper levels unchanged. Closed rewards desk, go to main cage now for cards.
Fortune Valley - no change
Gilpin - no change
Fitzgeralds - new gold level with brown logo on reverse (was white text), higher levels no changes
Lady Luck - new 2010 red cards, couldn't get blue cards to check
Isle of Capri - new 2010 cards same design as green 2009,
assume new 2010 red cards too but couldn't get any
Lodge - no change