Kim and some of the others work in oils in an ala prima style which is something I would love to learn to do. I just ordered the Richard Schmidt book, 'Ala Prima, Everything I know about painting', which just came out in paperback. The hard back version is 75 dollars and this new version is much more afordable. I love his work and am excited to get the book.
I have worked in oils a lot but have done the old master's technique of transparent glazing that I learned from Patricia Whitty. It is a very beautiful technique and I do like the result but it is very labor intensive and time consuming and I think it would be fun to finish a painting in a sitting so that you could travel and do oil instead of just watercolor.