Souring beer

[denn]

I'm a lover of sour beers and desperately would love to brew one. After reading up about it there is nothing that takes you through the actual process step by step. I have read about Bret and by using yogurt.
If there is any one on here who has been successful in brewing one I'd be grateful.
I was taking to a bloke at a brewery some time ago who knew someone that did one using a beer kit?

Secondly has anyone brewed beer using Rhubarb?

 

[Poochops]

http://www.thehomebrewforum.co.uk/showthread.php?t=72595

I did a very simple kettle soured one recently, covered in this thread, tasting next week.
Souring with yoghurt is relatively simple, you need to be able to keep the wort warm 35-40 degrees for 2-3 days, a ph meter is a must and knowing your water hardness helps