The market-leading guide to arguments, Writing Arguments ,8/e has proven highly successful in teaching readers to read arguments critically and to produce effective arguments of their own.
I've taught out of a decent number of rhet/comp textbooks in my time--professionally published, anthologies of student writing created by English departments, custom readers, etc.--and this is one of the better ones in my opinion. There are somethings I'm not completely thrilled with, but basically, this book is relatively clear and accessible. The explanations of rhetorical concepts and their purposes are generally easy to read and understand, which is helpful for students. And the selections of readings are good because they are not only relevant to interests students might have (or, at least, relevant to important issues in today's world, whether students are interested in those issues or not), but also typically present multiple perspectives on a topic, allowing students to compare and contrast different arguments about a subject. For instance, there are several different readings about whether charter schools are a good innovation for the US education system, with authors taking different sides about the quality of education they provide, whether "school choice" is actually an effective way of providing better education, etc.
I use this in my comp classes now. I'm required to, but I like it for its timely examples and its concise explanations of various aspects of rhetoric, though I'm uncertain whether I'll continue to use it in the future.
ethos, pathos, logos, kairos. probably not the best textbook for developmental writers, but a good foundation for budding rhetoricians (and anyone else interested in the topic).
Used in my writing 2010 class, a good guide for rhetorical writing and a thorough breakdown of writing dynamics. Also a helpful MLA/ALA guide in the back. I keep it around.
Actually it is the 5th Edition. I really did enjoy learning about the different types of argument, and the elements of rhetoric. I found this book to have a lot of real life application.