If you dig card games, you will love the app Blackjack 21, previously known as iBlackjack. Play against the house with official Vegas rules like double down and split. There is strategy assistance for hard or soft totals or splitting pairs. This version includes a running card counter, which will surely get you kicked out of the real Vegas if you happen to take your iPhone or touch with you when you visit the city. Blackjack has full support for OS 2.2 and a price of $1.99.