I use BarBack Drink Guide:
http://classic.pocketgear.com/softwa...l.asp?id=11498
It's a little pricey, but has a huge database. My only issue with it is that it doesn't have a random drink search. You can also try the webtender's mobile website wap.webtender.com. What I like most about that, besides the random drink, is that it'll list the top 10 drinks.