http://www.6mmbr.com/pillarbedding.html
One of the better and more complete articles. Personally I am not a fan of doing both pillars and bedding, one or the other is sufficient. In synthetic the pillars are faster and easier, though I still bed the majority of my synthetic stocks too. From personal experience I prefer bedded with Devcon 10110 in Walnut stocks. I believe it stabilises the action and wood better.