Code Kata

I've been investing some time in Code Kata. They seem to be an intruiging way to learn a new language and hone your skills. To that end, I am collecting a list of the most useful programming kata. Here are the ones I have so far:

Binary Search
Data Munging
Bloom Filters
Anagrams
Objectives
Checkout
Sorting
Code Comments
Trigrams
Dependencies
Word Chains
The Bowling Game
Prime Factors
Calculate the digits of PI
Eight Queens problem (N-Queens Problem)
Secret Santas
Sokoban
Countdown
Banned Words
Scrabble Stems
LCD Numbers
Animal Quiz
Paper, Rock, Scissors
1-800-THE-QUIZ
Roman Numerals
Texas Hold 'em
English Numerals
Knight's Travails
Barrel of Monkeys
Cows and Bulls (Mastermind)
Sodoku Solver
Center Strings
Format Number List
Survey Says
Four Letter Words
Histograms
Hangman
A Balancing Act
Interesting Anagrams
Repeated Substring