Some projects we run internally using are Scrum, while still being fixed everything to the customer.  We're experiencing mixed success on our part (the customer likes the visibility of the burndown chart). Can the types of projects we work be successfully executed using the agile methods?
Can fixed scope + fixed deadline + fixed price contract ever be made to work with agile?
agile;scrum
Well, I've worked mostly in agile environments (although we don't use the lingo), and I've done fixed cost things.  Generally what it amounts to is cost-plus, since no company can afford to do everything for free, and requirements do change and evolve as the customer figures out more clearly what they want.  The initial requirements for the fixed cost portion have to be done much more carefully than they are done in a typical iterative environment, making the process somewhat less iterative.  The plus part of the contract can be more iterative, provided we have fulfilled the fixed cost portion more or less satisfactorily to the customer.