I just got 50 nested IFs to work.

Here's the formula, for the masochists out there:

User.StateName = IF(Prop.StateNumber=1,"Delaware",

IF(Prop.StateNumber=2,"Pennsylvania",

IF(Prop.StateNumber=3,"New Jersey",

IF(Prop.StateNumber=4,"Georgia",

IF(Prop.StateNumber=5,"Connecticut",

IF(Prop.StateNumber=6,"Massachusetts",

IF(Prop.StateNumber=7,"Maryland",

IF(Prop.StateNumber=8,"South Carolina",

IF(Prop.StateNumber=9,"New Hampshire",

IF(Prop.StateNumber=10,"Virginia",

IF(Prop.StateNumber=11,"New York",

IF(Prop.StateNumber=12,"North Carolina",

IF(Prop.StateNumber=13,"Rhode Island",

IF(Prop.StateNumber=14,"Vermont",

IF(Prop.StateNumber=15,"Kentucky",

IF(Prop.StateNumber=16,"Tennessee",

IF(Prop.StateNumber=17,"Ohio",

IF(Prop.StateNumber=18,"Louisiana",

IF(Prop.StateNumber=19,"Indiana",

IF(Prop.StateNumber=20,"Mississippi",

IF(Prop.StateNumber=21,"Illinois",

IF(Prop.StateNumber=22,"Alabama",

IF(Prop.StateNumber=23,"Maine",

IF(Prop.StateNumber=24,"Missouri",

IF(Prop.StateNumber=25,"Arkansas",

IF(Prop.StateNumber=26,"Michigan",

IF(Prop.StateNumber=27,"Florida",

IF(Prop.StateNumber=28,"Texas",

IF(Prop.StateNumber=29,"Iowa",

IF(Prop.StateNumber=30,"Wisconsin",

IF(Prop.StateNumber=31,"California",

IF(Prop.StateNumber=32,"Minnesota",

IF(Prop.StateNumber=33,"Oregon",

IF(Prop.StateNumber=34,"Kansas",

IF(Prop.StateNumber=35,"West Virginia",

IF(Prop.StateNumber=36,"Nevada",

IF(Prop.StateNumber=37,"Nebraska",

IF(Prop.StateNumber=38,"Colorado",

IF(Prop.StateNumber=39,"North Dakota",

IF(Prop.StateNumber=40,"South Dakota",

IF(Prop.StateNumber=41,"Montana",

IF(Prop.StateNumber=42,"Washington",

IF(Prop.StateNumber=43,"Idaho",

IF(Prop.StateNumber=44,"Wyoming",

IF(Prop.StateNumber=45,"Utah",

IF(Prop.StateNumber=46,"Oklahoma",

IF(Prop.StateNumber=47,"New Mexico",

IF(Prop.StateNumber=48,"Arizona",

IF(Prop.StateNumber=49,"Alaska",

IF(Prop.StateNumber=50,"Hawaii",FALSE)

)))))))))))))))))))))))))))))))))))))))))))))))))

Of course I used VBA to generate- and stuff the formula. I'll probably publish the file as an article, as soon as I get a chance.