The official website for EFT is Gary Craig's site www.emofree.com . Gary developed EFT out of other similar techniques by Roger Callahan and Gary has done a really good job at bringing this powerful modality to everyone.
The technique itself is completely FREE and can be learnt in 15 minutes or so by everyone and it takes only a couple of minutes to run through the tapping sequence on the face and upper body. There are various HOW TO's available online but the FREE official manual is probably the best as it has been written by Gary and explains the background and process really well. It is a long manual containing 90-odd pages includes questions/answers and the technique itself along with pictures and explanations how to perform it.
If you are sceptical about how this kind of thing can work so well and so quickly, then join the queue. However, there are many, many people who have benefited from EFT and just because science cannot explain why something works does not mean that it cannot work. Put quite simple. It works and sometimes in a matter of minutes too.
The videos/DVDs are well worth buying if you are going to be seriously looking at this healing modality as they have many examples and extra refined techniques for making EFT even more powerful and of benefit to more people.