Darts Scorer
http://www.iphonedartsscorer.com/
Almost Gone Software
Version 1.2
$2.99
This one is my overall favorite so far. Its also one of the most expensive. But for $2.99 its a steal. It supports five x01 games (301, 501, 601, 701, 1001), it supports cricket *and* cutthroat cricket. It allows up to four players for all of its games. It supports, double in, double out, shows outshots, and even has a few stats.
Its interface is pretty intuitive, but I do prefer the single tap input that Bullistic has over a double and triple button.
In short: Buy this one.
