How to present in lecture a paper that students have read (or should I not have them read it)? I would like to present some classic computer science papers in a class I am teaching.  I know teachers usually assign papers before the lecture, but I can't figure out how to present material they've already read and likely understood.  In the case of a highly technical paper, I'd go over the more technical portions, perhaps letting them know beforehand not to struggle with the proofs, programming examples, etc., but I'm thinking of less technical papers, such as:


Reflections on Trusting Trust by Ken Thompson
The Cathedral and the Bazaar by Eric S. Raymond
No Silver Bullet by Fred Brooks


While I don't need to use pure lecture format, I am not sure that discussion would work well, since some of the papers (such as "Reflections on Trusting Trust") aren't really discussable, and my students lack the experience to discuss others (such as "No Silver Bullet").

EDIT: I was hoping not to task the students with extra prep, since they already have a lot of assignments to do, but, as some of you suggest, that may be the best way.
I recommend the discussion format. The two downsides of it you list can be overcome by using a guided discussion. When you assign the paper, also include a list of questions that you expect the students to be able to answer after having read the paper. When the class meets:


Select students at random (or through a random permutation).
Have the student answer an assigned question as a discussion seed.
Open up the floor to other students to make comments and pitch in their ideas (thus starting a discussion). 
When the topic dies down, move to the next question on the assigned list and repeat from step 1.


This format has several advantages:


It ensures that the students have read the paper (since they might get randomly selected)
It encourages them to think of their own answers and participate in discussions.
It eliminates the intimidating factor of the professor having tight control of the discussion (since you only moderate who speaks)
It lets you address the key points of the paper (through your initial selection of questions) without having to go over the whole paper in class.


I have experienced this format in upper level undergrad/grad courses during my undergrad and enjoyed it greatly. It really encouraged me to read papers and reflect on them carefully.