All you wanted to know about the Champions League
Who, what, when and where: ESPNcricinfo's dummy's guide to the Champions League

New South Wales won the inaugural edition of the Champions League • Global Cricket Ventures-BCCI
The Champions League Twenty20 (CLT20) is an invitational tournament featuring some of the top domestic Twenty20 sides. The event - run by the boards of India, Australia and South Africa - was conceptualised in 2008 once the money-spinning capacity of the Twenty20 format became evident following the success of the Indian Premier League. The CLT20 was first held in India in 2009, with the second edition hosted by South Africa in September 2010. The third installment is set to be hosted in India in September-October 2011.
The idea of an international competition between domestic sides was first mooted in the mid-1990s but it took currency only with the advent of Twenty20 cricket. Following the success of the IPL and other domestic Twenty20 leagues, officials in England, India, Australia and South Africa entered into discussions in 2008 to create an international inter-club competition. It was a paradigm shift for the sport: international cricket, till that point, meant national teams competing against each other. The new concept took it to the level of clubs, states and counties as the organisers sought to replicate the popularity of club-based competitions in other sports, most notably football, which ultimately took precedence over international fixtures. Lalit Modi, who was the chairman and commissioner of the IPL, took over as the chairman for this event as well, and ran the show until his IPL ouster in 2010.
The first edition of the tournament was to be held in India in December 2008 but was cancelled following the terrorist attacks in Mumbai on November 26. It was eventually held in September 2009, but the political situation ruled out the inclusion of a team from Pakistan. Yasir Arafat, representing Sussex, was the only player from Pakistan to feature in that event. No Pakistan player participated in the 2010 edition but allrounder Abdul Razzaq, representing Leicestershire, will feature in the 2011 tournament.
The planned 2008 edition was to have eight teams, from the three host countries, England and Pakistan.
In 2009, the 12 teams were split into four groups of three each, with two from each group proceeding to a league stage. The eight qualifiers were split into two leagues from which the semi-finalists were identified. The 2010 event had the ten teams split into two groups of five each, with the top two from each group contesting the semi-finals. The 2011 main draw will feature the same format.
Airtel, the Indian telecom company, snapped the title sponsorship of the tournament for a five-year period. They, however, ended their association with the tournament ahead of the 2011 event, after which Nokia became the title sponsors for a four-year period. ESPN-Star Sports have bagged the 10-year global broadcast rights for $975 million and will air the event live in the USA, the Middle East, South East Asia and other regions.
Since the event features franchise-based clubs unconstrained by national boundaries, there are instances of a player having to choose between two or more sides. For the 2010 season, Ross Taylor had to choose between three sides - his home team Central Districts, his IPL side Royal Challengers Bangalore, and Victoria. Kieron Pollard (Mumbai, South Australia, Somerset) faced a similar dilemma ahead of the 2011 season, as did Suraj Randiv (Chennai, Ruhuna) , Doug Bollinger (Chennai, NSW), Aiden Blizzard (Mumbai, South Australia), Brett Lee (Kolkata, NSW), Brad Haddin (Kolkata, NSW) and Davy Jacobs (Mumbai, Warriors).