I came across this great
worksheet for those who work on a project basis. It's geared towards web development, but it covers pretty well all of the areas including those we don't think about working into our quote because we look at them as something that isn't billable when in fact it should be considered.
My opinion is that if it's to do with a client, potential or current, it should be considered billable time and worked into the quote - this now helps me stay clear on what I need to do for the quote.